{
    "model": {
        "rank": 2922,
        "code": "thing-q82658",
        "model_id": "vr.tr.gypsum",
        "name": "gypsum",
        "purpose": "Enable an AI agent to recognise gypsum, assess the condition and suitability of a particular specimen or material lot, and identify justified handling, processing or use decisions.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.MAT",
        "industry": "",
        "version": "",
        "url": "/models/thing/q82658/",
        "tier": 2,
        "score": 94,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "energo-gypsum",
                "Lapis specularis",
                "plaster of Paris"
            ],
            "aliasCount": 3,
            "merged": 3,
            "knownIn": 94,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": "vr.tr.gypsum",
            "source": {
                "dataset": "wikidata",
                "item": "Q82658",
                "url": "https://www.wikidata.org/wiki/Q82658",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-07T13:42:57Z",
                "providers": [
                    "Codex",
                    "Grok"
                ],
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "usd": 0.00804746,
                        "turns": 1,
                        "seconds": 108.6,
                        "error": null
                    },
                    "codex": {
                        "seconds": 85.4,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c19-76e1-7e91-a464-c747c0891b36\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: gypsum\nRegistry id: vr.tr.gypsum\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\nA Vercy mod"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q82658",
                "registryId": "vr.tr.gypsum",
                "name": "gypsum",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.MAT"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q82658/",
            "model": {
                "registry_id": "vr.tr.gypsum",
                "name": "gypsum",
                "purpose": "Enable an AI agent to recognise gypsum, assess the condition and suitability of a particular specimen or material lot, and identify justified handling, processing or use decisions.",
                "definition": "Gypsum is the monoclinic evaporite mineral and industrial calcium sulfate dihydrate (CaSO4·2H2O) produced both as a rock-forming mineral and as a process by-product, distinguished from anhydrite and hemihydrate by its two waters of crystallization.",
                "scope_statement": "This model owns the material identity, composition, physical condition, transformation history and use-relevant evidence of gypsum under vr.tr.gypsum in PHY.MAT, including its occurrence as a constituent of mixtures while leaving host objects and processes to neighbouring models.",
                "in_scope": [
                    "Identification of the gypsum mineral phase and distinction from other calcium sulfate phases",
                    "Gypsum specimens, granular material, powders and identifiable gypsum constituents",
                    "Natural, manufactured and recovered material origins and their implications for testing",
                    "Phase proportions, impurities, free moisture, particle form and observed condition",
                    "Evidence supporting handling, processing, recovery and intended-use suitability"
                ],
                "out_of_scope": [
                    "Geological deposits, resource estimates and mine operations",
                    "Hemihydrate plaster and anhydrite as independently identified materials",
                    "Wallboard, plaster assemblies and finished building-product performance",
                    "Soil systems, crop requirements and amendment application prescriptions",
                    "Kilns, manufacturing processes and processing equipment",
                    "Waste-management facilities and transport operations"
                ],
                "distinguishing_features": [
                    "Confirm calcium sulfate dihydrate identity rather than relying on a generic calcium sulfate label; gypsum has this composition, while crude material may contain other minerals. [USGS: Mineral resource of the month - gypsum](https://www.usgs.gov/publications/mineral-resource-month-gypsum)",
                    "Require phase-sensitive identification capable of distinguishing gypsum from bassanite and anhydrite; a shared calcium-and-sulfate result does not resolve mineral identity. [USGS: Spectral properties of Ca-sulfates](https://www.usgs.gov/publications/spectral-properties-ca-sulfates-gypsum-bassanite-and-anhydrite)",
                    "For material confused with limestone or chalk, require evidence distinguishing a sulfate-bearing phase from a carbonate-bearing phase rather than accepting white colour or powder texture.",
                    "For material labelled plaster or drywall, determine whether the referent is gypsum itself, a transformed binder, or a composite containing gypsum before assigning this model.",
                    "Treat clear crystals, fibrous material and massive material as identification candidates requiring mineral evidence, rather than creating separate registered things from appearance alone."
                ],
                "characteristics": [
                    {
                        "name": "Mineral-phase identity",
                        "kind": "category",
                        "unit_or_values": "gypsum confirmed | gypsum-bearing mixture | suspected gypsum | other phase identified | unresolved",
                        "why_it_matters": "Determines whether this model applies to the material or only to a constituent."
                    },
                    {
                        "name": "Gypsum phase fraction",
                        "kind": "measurement",
                        "unit_or_values": "mass %, with analytical method, uncertainty and reporting basis",
                        "why_it_matters": "Separates mineral identity from bulk purity and supports comparisons between lots."
                    },
                    {
                        "name": "Other calcium sulfate phases",
                        "kind": "measurement",
                        "unit_or_values": "mass % of each identified phase, with detection limits and sample preparation",
                        "why_it_matters": "Supports assessment of mixed-phase material and possible transformation."
                    },
                    {
                        "name": "Source route",
                        "kind": "category",
                        "unit_or_values": "natural extraction | industrial production or recovery | product recycling | mixed | unknown",
                        "why_it_matters": "Directs provenance questions and the selection of impurity tests."
                    },
                    {
                        "name": "Source and host association",
                        "kind": "relation",
                        "unit_or_values": "links to source deposit, generating process, recovered product, host material and parent lot as applicable",
                        "why_it_matters": "Preserves material context without making a host object or source process part of gypsum identity."
                    },
                    {
                        "name": "Non-gypsum constituents",
                        "kind": "measurement",
                        "unit_or_values": "constituent-specific mass % or mg/kg, with method, detection limit and reporting basis",
                        "why_it_matters": "Provides evidence for processing compatibility and intended-use acceptance."
                    },
                    {
                        "name": "Free moisture",
                        "kind": "measurement",
                        "unit_or_values": "mass %, with wet or dry basis and a method accounting for possible loss of structural water",
                        "why_it_matters": "Supports handling and mass accounting without confusing surface water with hydration state."
                    },
                    {
                        "name": "Particle-size distribution",
                        "kind": "measurement",
                        "unit_or_values": "sieve fractions or d10, d50 and d90 in µm or mm, with method",
                        "why_it_matters": "Supports decisions about screening, milling, segregation and feed consistency."
                    },
                    {
                        "name": "Physical presentation",
                        "kind": "category",
                        "unit_or_values": "individual crystal | massive specimen | crushed rock | granules | powder | slurry | constituent in a composite",
                        "why_it_matters": "Determines how the material can be sampled, handled and assessed."
                    },
                    {
                        "name": "Observed material condition",
                        "kind": "state",
                        "unit_or_values": "recorded observations of wetting, caking, breakage, surface loss, foreign matter or suspected phase change",
                        "why_it_matters": "Identifies reasons to segregate material or repeat testing."
                    },
                    {
                        "name": "Thermal and water-exposure history",
                        "kind": "relation",
                        "unit_or_values": "links to dated heating, drying, wetting and storage events with known conditions",
                        "why_it_matters": "Connects current measurements to events that may have altered the material."
                    },
                    {
                        "name": "Intended-use qualification",
                        "kind": "state",
                        "unit_or_values": "unassessed | evidence incomplete | accepted for named use | conditionally accepted | rejected for named use",
                        "why_it_matters": "Prevents a general gypsum identity claim from being treated as approval for every application."
                    }
                ],
                "affordances": [
                    "Select representative samples and request evidence that distinguishes gypsum from other mineral phases.",
                    "Compare gypsum lots against a named use specification using phase composition, impurities, moisture and particle size.",
                    "Segregate or hold material whose identity, contamination or exposure history remains unresolved.",
                    "Evaluate crushing, screening, washing or drying proposals against the required resulting material condition.",
                    "Track conversion into another calcium sulfate material and link the resulting material to its appropriate model.",
                    "Assess recovered gypsum for a specified reuse route using documented separation and qualification evidence."
                ]
            },
            "sources": [
                {
                    "id": "usgs-mcs-gypsum",
                    "title": "Mineral Commodity Summaries: Gypsum",
                    "url": "https://www.usgs.gov/centers/national-minerals-information-center/gypsum-statistics-and-information",
                    "what_it_supports": "Industrial supply, FGD vs mined gypsum, wallboard and cement uses, typical US production practice.",
                    "url_status": "live"
                },
                {
                    "id": "wikidata-q3962",
                    "title": "Gypsum (Q3962)",
                    "url": "https://www.wikidata.org/wiki/Q3962",
                    "what_it_supports": "Canonical identifier, formula CaSO4·2H2O, IMA mineral status, CAS and HS crosswalks.",
                    "url_status": "live"
                },
                {
                    "id": "astm-c22",
                    "title": "ASTM C22/C22M Standard Specification for Gypsum",
                    "url": "",
                    "what_it_supports": "Product specification for gypsum as a construction raw material in North America."
                },
                {
                    "id": "en-13279",
                    "title": "EN 13279 Gypsum binders and gypsum plasters",
                    "url": "",
                    "what_it_supports": "European classification of building gypsums and plasters by calcination and intended use."
                },
                {
                    "id": "epa-40cfr61-r",
                    "title": "40 CFR Part 61 Subpart R - National Emission Standards for Radon Emissions from Phosphogypsum Stacks",
                    "url": "https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-61/subpart-R",
                    "what_it_supports": "US restriction of phosphogypsum, including the 10 pCi/g Ra-226 agricultural-use limit.",
                    "url_status": "live"
                }
            ],
            "structure": {
                "bundles": [
                    {
                        "id": "gypsum-identity-and-boundary",
                        "name": "Gypsum identity and boundary",
                        "description": "Establish what the material is and whether gypsum names the whole referent or a constituent.",
                        "rationale": "Calcium sulfate labels and gypsum-containing products can obscure the distinction between mineral identity and product identity.",
                        "layers": [
                            {
                                "id": "mineral-phase-identification",
                                "name": "Mineral phase identification",
                                "description": "Resolve gypsum identity against competing phase interpretations.",
                                "findings": [
                                    {
                                        "id": "dihydrate-identification-evidence",
                                        "name": "Dihydrate identification evidence",
                                        "description": "Record the observations, analytical interpretation and limitations supporting gypsum identification.",
                                        "questions": [
                                            {
                                                "text": "What evidence identifies the sampled material as gypsum rather than merely a calcium sulfate?",
                                                "kind": "definition",
                                                "id": "dihydrate-identification-evidence-q01"
                                            },
                                            {
                                                "text": "Which method distinguishes gypsum from bassanite, anhydrite and other detected phases, and with what uncertainty?",
                                                "kind": "measurement",
                                                "id": "dihydrate-identification-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "material-referent",
                                "name": "Material referent",
                                "description": "Determine the portion of a specimen, lot or product to which this model applies.",
                                "findings": [
                                    {
                                        "id": "whole-material-or-constituent",
                                        "name": "Whole material or constituent",
                                        "description": "Separate gypsum material assertions from assertions about mixtures and finished objects.",
                                        "questions": [
                                            {
                                                "text": "Does the name gypsum refer to a mineral specimen, a bulk material lot or a constituent within another object?",
                                                "kind": "boundary",
                                                "id": "whole-material-or-constituent-q01"
                                            },
                                            {
                                                "text": "Which host, mixture or product model owns properties that cannot be attributed to the gypsum constituent alone?",
                                                "kind": "boundary",
                                                "id": "whole-material-or-constituent-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "origin-and-composition",
                        "name": "Origin and composition",
                        "description": "Connect gypsum origin and processing lineage to measured composition.",
                        "rationale": "A common mineral identity does not establish equivalent impurity profiles or suitability across source routes.",
                        "layers": [
                            {
                                "id": "gypsum-source-route",
                                "name": "Gypsum source route",
                                "description": "Identify how the material arose and what was combined into the current lot.",
                                "findings": [
                                    {
                                        "id": "generation-and-recovery-lineage",
                                        "name": "Generation and recovery lineage",
                                        "description": "Record extraction, industrial generation or product-recovery evidence relevant to material assessment.",
                                        "questions": [
                                            {
                                                "text": "Which deposit, generating process or recovered product supplied this gypsum, and what records substantiate that origin?",
                                                "kind": "provenance",
                                                "id": "generation-and-recovery-lineage-q01"
                                            },
                                            {
                                                "text": "Which source lots, additives or recovered fractions were combined before the current sample was taken?",
                                                "kind": "provenance",
                                                "id": "generation-and-recovery-lineage-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "phase-and-impurity-profile",
                                "name": "Phase and impurity profile",
                                "description": "Resolve gypsum content and accompanying constituents on an explicit analytical basis.",
                                "findings": [
                                    {
                                        "id": "composition-and-sampling-confidence",
                                        "name": "Composition and sampling confidence",
                                        "description": "Establish how well measured phase fractions and impurities describe the lot.",
                                        "questions": [
                                            {
                                                "text": "What are the measured gypsum, other calcium sulfate and non-gypsum fractions, with methods and reporting bases?",
                                                "kind": "measurement",
                                                "id": "composition-and-sampling-confidence-q01"
                                            },
                                            {
                                                "text": "How does sampling account for segregation, visible inclusions or variation across the gypsum lot?",
                                                "kind": "measurement",
                                                "id": "composition-and-sampling-confidence-q02"
                                            },
                                            {
                                                "text": "Which additional constituents require testing because of this source route and proposed use?",
                                                "kind": "action",
                                                "id": "composition-and-sampling-confidence-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "physical-form-and-water-condition",
                        "name": "Physical form and water condition",
                        "description": "Characterise the gypsum's presentation, particle population and water-related condition.",
                        "rationale": "Gypsum identity alone cannot determine sample representativeness, handling behaviour or the meaning of a moisture result.",
                        "layers": [
                            {
                                "id": "crystal-and-particle-form",
                                "name": "Crystal and particle form",
                                "description": "Describe intact specimens and processed particle populations at the scale relevant to the intended action.",
                                "findings": [
                                    {
                                        "id": "form-and-size-evidence",
                                        "name": "Form and size evidence",
                                        "description": "Record morphology, particle size and aggregation without treating appearance as sufficient identification.",
                                        "questions": [
                                            {
                                                "text": "Is the gypsum present as intact crystals, massive material, particles, slurry solids or an embedded constituent?",
                                                "kind": "definition",
                                                "id": "form-and-size-evidence-q01"
                                            },
                                            {
                                                "text": "What measurements describe particle size, fines and agglomerates at the scale required for sampling or processing?",
                                                "kind": "measurement",
                                                "id": "form-and-size-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "free-water-and-observed-change",
                                "name": "Free water and observed change",
                                "description": "Separate measured free moisture from structural-water questions and record physical changes.",
                                "findings": [
                                    {
                                        "id": "moisture-and-condition-assessment",
                                        "name": "Moisture and condition assessment",
                                        "description": "Interpret water measurements alongside caking, wetting and specimen deterioration observations.",
                                        "questions": [
                                            {
                                                "text": "What is the free-moisture content, and how does the method account for possible structural-water loss?",
                                                "kind": "measurement",
                                                "id": "moisture-and-condition-assessment-q01"
                                            },
                                            {
                                                "text": "What evidence of caking, surface loss, breakage or water exposure requires resampling or a change in handling?",
                                                "kind": "action",
                                                "id": "moisture-and-condition-assessment-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "phase-change-and-processing",
                        "name": "Phase change and processing",
                        "description": "Track interventions that may alter gypsum condition, composition or mineral identity.",
                        "rationale": "An agent must distinguish preparation of gypsum from conversion into a different material and verify the actual outcome.",
                        "layers": [
                            {
                                "id": "thermal-and-hydration-history",
                                "name": "Thermal and hydration history",
                                "description": "Relate exposure records to evidence about current calcium sulfate phases.",
                                "findings": [
                                    {
                                        "id": "exposure-linked-phase-state",
                                        "name": "Exposure-linked phase state",
                                        "description": "Record known treatment conditions and identify where phase reassessment is needed.",
                                        "questions": [
                                            {
                                                "text": "What heating, drying or water-contact events occurred, with temperature, duration and environmental conditions where known?",
                                                "kind": "provenance",
                                                "id": "exposure-linked-phase-state-q01"
                                            },
                                            {
                                                "text": "What before-and-after phase measurements establish whether gypsum identity was retained or changed?",
                                                "kind": "measurement",
                                                "id": "exposure-linked-phase-state-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "processing-outcome-and-handoff",
                                "name": "Processing outcome and handoff",
                                "description": "Define acceptable results of preparation or conversion and assign resulting material identity.",
                                "findings": [
                                    {
                                        "id": "intervention-acceptance",
                                        "name": "Intervention acceptance",
                                        "description": "Tie processing permission to an intended material outcome and a verification requirement.",
                                        "questions": [
                                            {
                                                "text": "For the proposed crushing, screening, washing, drying or thermal conversion, what resulting phase composition and physical condition are required?",
                                                "kind": "action",
                                                "id": "intervention-acceptance-q01"
                                            },
                                            {
                                                "text": "What measured outcome requires a link to a different material model rather than continued identification of the output as gypsum?",
                                                "kind": "boundary",
                                                "id": "intervention-acceptance-q02"
                                            },
                                            {
                                                "text": "Which post-treatment checks must pass before the resulting lot is released for its intended use?",
                                                "kind": "action",
                                                "id": "intervention-acceptance-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-qualification-and-recovery",
                        "name": "Use qualification and recovery",
                        "description": "Determine which proposed uses and recovery routes have adequate material-specific evidence.",
                        "rationale": "Gypsum identification does not establish application fitness, contaminant acceptance or equivalence between virgin and recovered feedstocks.",
                        "layers": [
                            {
                                "id": "application-specific-acceptance",
                                "name": "Application-specific acceptance",
                                "description": "Evaluate material evidence against a named receiving process or application.",
                                "findings": [
                                    {
                                        "id": "qualified-use-envelope",
                                        "name": "Qualified use envelope",
                                        "description": "Record the scope and conditions of an acceptance decision without importing whole-system performance claims.",
                                        "questions": [
                                            {
                                                "text": "Which intended use and identified specification define acceptable gypsum content, impurities, moisture and particle size?",
                                                "kind": "boundary",
                                                "id": "qualified-use-envelope-q01"
                                            },
                                            {
                                                "text": "Which lot-specific results satisfy those requirements, and which unresolved results prevent acceptance?",
                                                "kind": "measurement",
                                                "id": "qualified-use-envelope-q02"
                                            },
                                            {
                                                "text": "What material or storage change invalidates the qualification and triggers reassessment?",
                                                "kind": "action",
                                                "id": "qualified-use-envelope-q03"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "handling-and-recovered-feedstock",
                                "name": "Handling and recovered feedstock",
                                "description": "Support material-specific handling and reuse decisions from actual condition and separation evidence.",
                                "findings": [
                                    {
                                        "id": "handling-and-recovery-readiness",
                                        "name": "Handling and recovery readiness",
                                        "description": "Identify restrictions and required checks arising from fine particles, residual host materials or uncertain contamination.",
                                        "questions": [
                                            {
                                                "text": "What handling controls are justified by the gypsum's particle form, constituent test results and applicable material documentation?",
                                                "kind": "action",
                                                "id": "handling-and-recovery-readiness-q01"
                                            },
                                            {
                                                "text": "For recovered gypsum, what evidence establishes removal or acceptable levels of paper, coatings, adhesives and other host-material residues?",
                                                "kind": "measurement",
                                                "id": "handling-and-recovery-readiness-q02"
                                            },
                                            {
                                                "text": "Which named receiving route can accept this lot, and what unresolved evidence requires segregation or further treatment?",
                                                "kind": "action",
                                                "id": "handling-and-recovery-readiness-q03"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "evidence-and-external-alignment",
                        "name": "Evidence and external alignment",
                        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
                        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
                        "layers": [
                            {
                                "id": "reported-evidence",
                                "name": "Reported evidence",
                                "description": "Findings from the breadth pass, kept separate from the structural claims.",
                                "findings": [
                                    {
                                        "id": "evidence-kinds",
                                        "name": "Kinds and varieties",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Natural rock gypsum (massive bedded evaporite)",
                                            "Selenite (transparent crystalline gypsum)",
                                            "Satin spar (fibrous gypsum)",
                                            "Alabaster (fine massive gypsum for carving)",
                                            "FGD / synthetic gypsum from flue-gas desulfurization",
                                            "Phosphogypsum from wet-process phosphoric acid",
                                            "Recycled gypsum from construction and demolition board",
                                            "Agricultural gypsum (soil amendment grade)"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "scheme": "Wikidata",
                                                "value_or_pattern": "Q3962",
                                                "note": "Item for the mineral gypsum."
                                            },
                                            {
                                                "scheme": "IMA-CNMNC",
                                                "value_or_pattern": "Gypsum (symbol Gp)",
                                                "note": "Approved mineral species; formula CaSO4·2H2O."
                                            },
                                            {
                                                "scheme": "CAS Registry Number",
                                                "value_or_pattern": "13397-24-5",
                                                "note": "Gypsum as a natural/commercial substance; dihydrate chemistry is also indexed as 10101-41-4."
                                            },
                                            {
                                                "scheme": "EC number",
                                                "value_or_pattern": "231-900-3",
                                                "note": "Calcium sulfate (covers the sulfate family rather than the dihydrate alone)."
                                            },
                                            {
                                                "scheme": "HS / Harmonized System",
                                                "value_or_pattern": "2520",
                                                "note": "Gypsum, anhydrite, and plasters (consisting of calcined gypsum)."
                                            },
                                            {
                                                "scheme": "Nickel-Strunz",
                                                "value_or_pattern": "7.CD.40",
                                                "note": "Sulfate class, hydrated calcium sulfate."
                                            },
                                            {
                                                "scheme": "Mindat mineral id",
                                                "value_or_pattern": "1784",
                                                "note": "Mineral species record for gypsum."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-standards-and-regulation",
                                        "name": "Standards and regulation",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "ASTM C22/C22M - Standard Specification for Gypsum (ASTM International)",
                                            "ASTM C28/C28M - Gypsum plasters (ASTM International)",
                                            "ASTM C1396/C1396M - Gypsum board (ASTM International)",
                                            "ASTM C471/C472 - chemical and physical testing of gypsum and gypsum products (ASTM International)",
                                            "EN 13279 - Gypsum binders and gypsum plasters (CEN)",
                                            "EN 520 - Gypsum plasterboards (CEN)",
                                            "40 CFR 61 Subpart R - radon emissions and reuse limits for phosphogypsum (US EPA)",
                                            "OSHA PELs for calcium sulfate / gypsum dust: 15 mg/m3 total, 5 mg/m3 respirable (US OSHA)",
                                            "Food additive E516 calcium sulfate where food-grade sulfate, not mineral gypsum, is specified (EU / Codex practice)"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-standards-and-regulation-q01",
                                                "text": "Which of these standards and regulation hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-real-world-use",
                                        "name": "Real-world use",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Feedstock for gypsum wallboard (drywall / plasterboard), the dominant construction use.",
                                            "Set retarder in Portland cement clinker grinding, typically a few percent gypsum or anhydrite.",
                                            "Interior plasters, mouldings, joint compounds, and fire-rated assemblies that rely on dehydration of the dihydrate.",
                                            "Agricultural soil amendment for calcium and sulfate supply and for reclaiming sodic soils.",
                                            "Dental, orthopedic, and art plasters after calcination to hemihydrate (plaster of Paris).",
                                            "Carving stone as alabaster; optical/cleavage crystals as selenite.",
                                            "Marketed synthetic gypsum from coal-plant FGD units, often substituting for mined rock in wallboard plants."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-measurements",
                                        "name": "Typical measurements",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "quantity": "Combined water (loss on dehydration of the dihydrate)",
                                                "typical_range": "19-21 (theoretical 20.9)",
                                                "unit": "mass %"
                                            },
                                            {
                                                "quantity": "Mohs hardness",
                                                "typical_range": "2",
                                                "unit": "Mohs"
                                            },
                                            {
                                                "quantity": "Specific gravity",
                                                "typical_range": "2.31-2.33",
                                                "unit": "g/cm3"
                                            },
                                            {
                                                "quantity": "Aqueous solubility (near 20-25 °C)",
                                                "typical_range": "2.0-2.6",
                                                "unit": "g/L"
                                            },
                                            {
                                                "quantity": "Dehydration to hemihydrate",
                                                "typical_range": "about 100-160",
                                                "unit": "°C"
                                            },
                                            {
                                                "quantity": "CaSO4·2H2O purity of commercial rock or FGD gypsum",
                                                "typical_range": "80-98 (FGD often >95)",
                                                "unit": "mass %"
                                            },
                                            {
                                                "quantity": "Ra-226 in phosphogypsum proposed for agricultural use (US EPA ceiling)",
                                                "typical_range": "≤10 (370 Bq/kg)",
                                                "unit": "pCi/g"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-failure-modes-and-hazards",
                                        "name": "Failure modes and hazards",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "Dissolution and karst collapse in gypsum terrains; settlement of foundations on gypsum soils.",
                                            "Moisture damage of paper-faced board: mould, loss of strength, and fastener pull-out.",
                                            "Fire performance of board is lost once the dihydrate is fully dehydrated and the core disintegrates.",
                                            "Excess gypsum in cement can cause flash/false set or later sulfate-related expansion.",
                                            "Phosphogypsum carries Ra-226 and radon; stacking and most building reuse are restricted.",
                                            "Wet gypsum against steel or aluminium can drive corrosion; some imported boards have off-gassed reduced sulfur compounds.",
                                            "Nuisance dust; not a high-toxicity mineral, but respirable dust is regulated.",
                                            "Under reducing conditions, sulfate from gypsum can feed hydrogen sulfide generation."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-regional-variation",
                                        "name": "Regional variation",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            "United States: 'drywall'/'sheetrock'; wallboard plants now run largely on FGD gypsum rather than mined rock.",
                                            "United Kingdom and much of Europe: 'plasterboard'; product classified under EN 520 / EN 13279 rather than ASTM C1396.",
                                            "German trade still distinguishes calcination grades (e.g. Stuckgips vs Estrichgips) even after EN harmonisation.",
                                            "Phosphogypsum practice is locally specific: large stacks in Florida, North Africa, Brazil and India, with agricultural or fill reuse allowed only under activity limits.",
                                            "Alabaster carving traditions are concentrated historically in Volterra (Italy) and parts of Spain and Egypt.",
                                            "The name plaster of Paris records the Montmartre gypsum workings; it now means hemihydrate plaster worldwide."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-neighbours",
                                        "name": "Neighbouring kinds and how to tell them apart",
                                        "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.",
                                        "evidence": [
                                            {
                                                "name": "Anhydrite (CaSO4)",
                                                "difference": "No water of crystallization: loss on heating near 100-200 °C is negligible for anhydrite (~21% for gypsum); anhydrite is harder (Mohs ~3-3.5) and denser."
                                            },
                                            {
                                                "name": "Bassanite / plaster of Paris (CaSO4·½H2O)",
                                                "difference": "Combined water ~6.2% versus ~20.9%; hemihydrate sets with water to regenerate gypsum."
                                            },
                                            {
                                                "name": "Calcite / chalk (CaCO3)",
                                                "difference": "Dilute HCl: calcite effervesces strongly, gypsum does not; fingernail scratches gypsum, not typical calcite."
                                            },
                                            {
                                                "name": "Halite",
                                                "difference": "Halite tastes salty and is highly water-soluble; gypsum is only sparingly soluble and not salty."
                                            },
                                            {
                                                "name": "Barite (BaSO4)",
                                                "difference": "Barite specific gravity ~4.5 versus ~2.3; barite is much less soluble and harder."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of gypsum this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "With no registry definition recorded, should vr.tr.gypsum cover both the mineral species and commercial gypsum-rich bulk materials, and how should that boundary be expressed without inventing a purity threshold?",
                "Does an existing Vercy world model already own this concept, and which neighbouring entries own plaster, bassanite, anhydrite and gypsum-containing products?",
                "Which analytical and sample-preparation methods should be recognised for phase quantification and free-moisture measurement without materially changing the sample?",
                "Which source-route-specific impurity panels and application-specific acceptance criteria are supported by authoritative evidence for the intended jurisdictions?",
                "What evidence-based exposure or condition changes should trigger phase reassessment, renewed use qualification or rejection of recovered gypsum?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 18,
                "questions": 32
            }
        },
        "draft": {
            "generator": "vr.draft.v3",
            "status": "draft-generated",
            "researched": false,
            "archetype": "chemical substance or material",
            "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.",
            "facetsInferred": true,
            "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.",
            "purpose": "Give an agent a durable, checkable way to recognise a gypsum, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an AI agent to recognise gypsum, assess the condition and suitability of a particular specimen or material lot, and identify justified handling, processing or use decisions.",
            "characteristics": {
                "substance": "material",
                "origin": "natural",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured",
                "consumed or used up"
            ],
            "distinguishingFeatures": [
                "Names folded into this entry, which a task may need to split apart again: energo-gypsum, Lapis specularis, plaster of Paris.",
                "3 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 94 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is."
            ],
            "openQuestionsForResearch": [
                "Which of the bundles below does a real task actually need, and which are ceremony?",
                "What does this thing have that the facets do not capture at all?",
                "Which neighbouring kind is most often confused with a gypsum, and on what evidence are they told apart?"
            ],
            "whatItIsMadeOf": "matter you can touch",
            "physicalCharacter": [
                "Mobility varies between examples.",
                "Does nothing on its own; everything it does, something else did to it.",
                "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing."
            ],
            "whatCanBeDoneWithIt": [
                "observe it, measure it, record its state",
                "use it up, and then need more of it"
            ],
            "howItIsRecognised": [
                "Not recognisable by sight in any reliable way. Appearance varies with grade, form and additives; identification is by label, by documentation, or by assay."
            ],
            "relatedModels": [
                {
                    "relation": "covers",
                    "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.",
                    "targets": [
                        "energo-gypsum",
                        "Lapis specularis",
                        "plaster of Paris"
                    ]
                }
            ],
            "standing": "Described in 94 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 3 finer distinctions are held inside this entry as names rather than as separate models.",
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-classification",
                        "name": "Identity, naming and classification",
                        "description": "How an agent tells one gypsum from another, and a gypsum from things that resemble it.",
                        "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.",
                        "layers": [
                            {
                                "id": "naming-and-identifiers",
                                "name": "Names and identifiers",
                                "description": "The names this thing goes by and the identifiers that survive translation and time.",
                                "findings": [
                                    {
                                        "id": "preferred-name-and-aliases",
                                        "name": "Preferred name, aliases and local names",
                                        "description": "Which name to use, which names mean the same thing, and which merely sound similar.",
                                        "questions": [
                                            {
                                                "id": "preferred-name-and-aliases-q01",
                                                "text": "What identifies and describes the name of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "preferred-name-and-aliases-q02",
                                                "text": "Who or what asserted this about the name of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "preferred-name-and-aliases-q03",
                                                "text": "What may an agent decide or do once the name of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    },
                                    {
                                        "id": "stable-identifiers",
                                        "name": "Stable identifiers and external keys",
                                        "description": "Identifiers that keep pointing at this kind of thing across systems and languages.",
                                        "questions": [
                                            {
                                                "id": "stable-identifiers-q01",
                                                "text": "What identifies and describes an identifier for a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "stable-identifiers-q02",
                                                "text": "Who or what asserted this about an identifier for a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "stable-identifiers-q03",
                                                "text": "What may an agent decide or do once an identifier for a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "classification-and-granularity",
                                "name": "Classification and granularity",
                                "description": "Where a gypsum sits among kinds, and how finely a task needs to cut it.",
                                "findings": [
                                    {
                                        "id": "kind-and-parents",
                                        "name": "Kind, parents and neighbouring kinds",
                                        "description": "The classes this thing belongs to and the ones it is next to.",
                                        "questions": [
                                            {
                                                "id": "kind-and-parents-q01",
                                                "text": "What identifies and describes the kind of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "kind-and-parents-q02",
                                                "text": "Who or what asserted this about the kind of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "kind-and-parents-q03",
                                                "text": "What may an agent decide or do once the kind of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    },
                                    {
                                        "id": "distinguishing-features",
                                        "name": "Distinguishing features",
                                        "description": "What separates a gypsum from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "distinguishing-features-q02",
                                                "text": "Who or what asserted this about what distinguishes a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "distinguishing-features-q03",
                                                "text": "What may an agent decide or do once what distinguishes a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "form-and-composition",
                        "name": "Form, composition and condition",
                        "description": "What a gypsum is made of, what shape and size it takes, and what state it is in.",
                        "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.",
                        "layers": [
                            {
                                "id": "form-and-dimensions",
                                "name": "Form and dimensions",
                                "description": "Shape, size, mass and the ranges these take across examples.",
                                "findings": [
                                    {
                                        "id": "measurable-dimensions",
                                        "name": "Measurable dimensions and their units",
                                        "description": "The quantities worth recording and the units they are recorded in.",
                                        "questions": [
                                            {
                                                "id": "measurable-dimensions-q01",
                                                "text": "What identifies and describes the dimensions of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q02",
                                                "text": "Who or what asserted this about the dimensions of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q03",
                                                "text": "What may an agent decide or do once the dimensions of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "material-and-composition",
                                "name": "Material and composition",
                                "description": "Materials, parts and how they are put together.",
                                "findings": [
                                    {
                                        "id": "parts-and-materials",
                                        "name": "Parts and materials",
                                        "description": "What a gypsum is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q02",
                                                "text": "Who or what asserted this about the composition of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q03",
                                                "text": "What may an agent decide or do once the composition of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-integrity",
                                "name": "Condition and integrity",
                                "description": "Wear, damage, health and the difference between working and broken.",
                                "findings": [
                                    {
                                        "id": "condition-assessment",
                                        "name": "Condition, damage and health",
                                        "description": "How the condition of a gypsum is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q02",
                                                "text": "Who or what asserted this about the condition of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q03",
                                                "text": "What may an agent decide or do once the condition of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "place-and-movement",
                        "name": "Place and movement",
                        "description": "Where a gypsum is, how it got there and where it may go (varies).",
                        "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.",
                        "layers": [
                            {
                                "id": "location-and-placement",
                                "name": "Location and placement",
                                "description": "Position, containment and the reference frame the position is given in.",
                                "findings": [
                                    {
                                        "id": "position-and-frame",
                                        "name": "Position, container and reference frame",
                                        "description": "Where a gypsum is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q02",
                                                "text": "Who or what asserted this about the location of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q03",
                                                "text": "What may an agent decide or do once the location of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "movement-and-transfer",
                                "name": "Movement and transfer",
                                "description": "How a gypsum is carried, installed or relocated.",
                                "findings": [
                                    {
                                        "id": "movement-events",
                                        "name": "Movement events and constraints",
                                        "description": "What counts as a movement, what records it and what limits it.",
                                        "questions": [
                                            {
                                                "id": "movement-events-q01",
                                                "text": "What identifies and describes the movement of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q02",
                                                "text": "Who or what asserted this about the movement of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q03",
                                                "text": "What may an agent decide or do once the movement of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "state-and-lifecycle",
                        "name": "State and lifecycle",
                        "description": "The states a gypsum passes through and the events that move it between them.",
                        "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.",
                        "layers": [
                            {
                                "id": "lifecycle-stages",
                                "name": "Lifecycle stages",
                                "description": "From coming into existence to ceasing to be one of these.",
                                "findings": [
                                    {
                                        "id": "stages-and-transitions",
                                        "name": "Stages and transitions",
                                        "description": "The stages worth naming and what moves a gypsum between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "stages-and-transitions-q02",
                                                "text": "Who or what asserted this about the lifecycle of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "stages-and-transitions-q03",
                                                "text": "What may an agent decide or do once the lifecycle of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "observations-and-status",
                                "name": "Observations and current status",
                                "description": "What is observed about a gypsum, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a gypsum is recorded so that it can be superseded rather than overwritten.",
                                        "questions": [
                                            {
                                                "id": "observation-record-q01",
                                                "text": "What identifies and describes an observation of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "observation-record-q02",
                                                "text": "Who or what asserted this about an observation of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "observation-record-q03",
                                                "text": "What may an agent decide or do once an observation of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-and-operation",
                        "name": "Use and operation",
                        "description": "What can be done with a gypsum and what it takes to do it.",
                        "rationale": "An agent that can recognise a thing but not act on it has only half a model.",
                        "layers": [
                            {
                                "id": "intended-use",
                                "name": "Intended use and function",
                                "description": "What a gypsum is for, and what it is used for anyway.",
                                "findings": [
                                    {
                                        "id": "function-and-purpose",
                                        "name": "Function, purpose and misuse",
                                        "description": "The function a gypsum performs and the uses that fall outside it.",
                                        "questions": [
                                            {
                                                "id": "function-and-purpose-q01",
                                                "text": "What identifies and describes the use of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q02",
                                                "text": "Who or what asserted this about the use of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q03",
                                                "text": "What may an agent decide or do once the use of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "handling-and-procedure",
                                "name": "Handling and procedure",
                                "description": "The steps, skills and tools involved in using a gypsum.",
                                "findings": [
                                    {
                                        "id": "procedures-and-skills",
                                        "name": "Procedures, skills and required tools",
                                        "description": "What an agent needs before it can act on a gypsum at all.",
                                        "questions": [
                                            {
                                                "id": "procedures-and-skills-q01",
                                                "text": "What identifies and describes handling a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q02",
                                                "text": "Who or what asserted this about handling a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q03",
                                                "text": "What may an agent decide or do once handling a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "supply-and-consumption",
                                "name": "Supply and consumption",
                                "description": "Quantities, rates and what running out means.",
                                "findings": [
                                    {
                                        "id": "consumption-and-stock",
                                        "name": "Consumption, stock and replenishment",
                                        "description": "How much of a gypsum there is and how fast it goes.",
                                        "questions": [
                                            {
                                                "id": "consumption-and-stock-q01",
                                                "text": "What identifies and describes the supply of a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "consumption-and-stock-q02",
                                                "text": "Who or what asserted this about the supply of a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "consumption-and-stock-q03",
                                                "text": "What may an agent decide or do once the supply of a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "composition-and-identity",
                        "name": "Composition, grade and chemical identity",
                        "description": "What gypsum is made of and how pure the thing in hand is.",
                        "rationale": "Grade decides what a substance may be used for, so a model that records only the name cannot support any decision about use.",
                        "layers": [
                            {
                                "id": "chemical-identity",
                                "name": "Chemical identity",
                                "description": "Formula, structure and the registry numbers that name it unambiguously.",
                                "findings": [
                                    {
                                        "id": "identity-record",
                                        "name": "Identity and registry numbers",
                                        "description": "What identifies this substance across suppliers and regulators.",
                                        "questions": [
                                            {
                                                "id": "identity-record-q01",
                                                "text": "What formula, structure and registry identifiers name gypsum unambiguously?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "identity-record-q02",
                                                "text": "Which related substances share a name in common use but not an identifier?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "grade-and-impurities",
                                "name": "Grade, purity and impurities",
                                "description": "The specification a batch meets and what else is in it.",
                                "findings": [
                                    {
                                        "id": "specification",
                                        "name": "Specification and assay",
                                        "description": "How purity is stated and measured, and which impurities matter.",
                                        "questions": [
                                            {
                                                "id": "specification-q01",
                                                "text": "What grades of gypsum exist, how is purity assayed, and which impurities are limited?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "specification-q02",
                                                "text": "Which use requires which grade, and what happens when a lower grade is substituted?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "properties-and-behaviour",
                        "name": "Properties and behaviour",
                        "description": "How gypsum behaves under conditions an agent can measure or change.",
                        "rationale": "Physical constants are the part of a substance model that transfers between contexts, and each needs its unit and its conditions.",
                        "layers": [
                            {
                                "id": "physical-constants",
                                "name": "Physical constants",
                                "description": "Values that hold for the pure substance, with their conditions.",
                                "findings": [
                                    {
                                        "id": "constants-record",
                                        "name": "Constants and conditions",
                                        "description": "The quantities worth recording and the state they apply in.",
                                        "questions": [
                                            {
                                                "id": "constants-record-q01",
                                                "text": "What are the defining physical constants of gypsum, in what units and under what conditions?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "constants-record-q02",
                                                "text": "Which of these values change with grade or form rather than being fixed?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "stability-and-reactivity",
                                "name": "Stability and reactivity",
                                "description": "What it reacts with, degrades into, and how it is stored.",
                                "findings": [
                                    {
                                        "id": "incompatibilities",
                                        "name": "Incompatibilities and degradation",
                                        "description": "What must not meet it, and what it becomes over time.",
                                        "questions": [
                                            {
                                                "id": "incompatibilities-q01",
                                                "text": "What is gypsum incompatible with, and what does it degrade into under storage?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "incompatibilities-q02",
                                                "text": "What storage and handling does that require, and who is competent to do it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "hazard-and-regulation",
                        "name": "Hazard classification and regulation",
                        "description": "How gypsum can harm, and what the law says about holding and moving it.",
                        "rationale": "A substance model without its hazard class and its regulatory identity is unusable in exactly the situations that matter.",
                        "layers": [
                            {
                                "id": "hazard-class",
                                "name": "Hazard classification",
                                "description": "Classified hazards, exposure limits and protective measures.",
                                "findings": [
                                    {
                                        "id": "classified-hazards",
                                        "name": "Classified hazards and limits",
                                        "description": "The classification, the scheme it belongs to, and the limits set.",
                                        "questions": [
                                            {
                                                "id": "classified-hazards-q01",
                                                "text": "How is gypsum classified for hazard, under which scheme, and what exposure limits apply?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "classified-hazards-q02",
                                                "text": "What protection does handling require, and what must an agent refuse to do without it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "regulatory-identity",
                                "name": "Regulatory identity and control",
                                "description": "Registration, restriction and transport rules by jurisdiction.",
                                "findings": [
                                    {
                                        "id": "controls",
                                        "name": "Controls and jurisdiction",
                                        "description": "Where it is restricted and what the restriction attaches to.",
                                        "questions": [
                                            {
                                                "id": "controls-q01",
                                                "text": "Which registrations, restrictions or transport rules cover gypsum, and where?",
                                                "kind": "provenance"
                                            },
                                            {
                                                "id": "controls-q02",
                                                "text": "Does the control attach to the substance, its concentration, or its intended use?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "provenance-and-evidence",
                        "name": "Provenance, evidence and time",
                        "description": "Where every claim about a gypsum came from and when it held.",
                        "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.",
                        "layers": [
                            {
                                "id": "source-and-authority",
                                "name": "Source and authority",
                                "description": "Who said it, on what evidence, and how strongly.",
                                "findings": [
                                    {
                                        "id": "claim-provenance",
                                        "name": "Claim provenance and confidence",
                                        "description": "The authority behind each claim about a gypsum and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "claim-provenance-q02",
                                                "text": "Who or what asserted this about a claim about a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "claim-provenance-q03",
                                                "text": "What may an agent decide or do once a claim about a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "time-and-versions",
                                "name": "Time, versions and supersession",
                                "description": "When a claim was true, when it was learnt, and what replaced it.",
                                "findings": [
                                    {
                                        "id": "validity-and-supersession",
                                        "name": "Validity period and supersession",
                                        "description": "How an old claim about a gypsum is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a gypsum, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "validity-and-supersession-q02",
                                                "text": "Who or what asserted this about the validity of a claim about a gypsum, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "validity-and-supersession-q03",
                                                "text": "What may an agent decide or do once the validity of a claim about a gypsum is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "statistics": {
                "bundles": 9,
                "layers": 20,
                "findings": 22,
                "questions": 60
            }
        }
    }
}