margaritasite
Enable an agent to identify margaritasite, assess the composition and condition of a specimen, and determine which characterization or handling actions its evidence supports.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 13 findings · 21 questions
Species and composition Establish the chemical evidence for naming a phase margaritasite.
Species boundary
Separate mineral identification from provisional labels and related compositions.
Cesium-dominance evidence
Record phase-specific cation proportions and the nomenclature authority used to interpret them.
- Does the analyzed mineral domain support cesium dominance, and which accepted naming criterion is being applied? boundary
- Were cesium and potassium measured within the same identified phase or only in a bulk specimen? measurement
Formula accounting
Keep measured constituents separate from normalization and charge-balance assumptions.
Constituents and assumptions
Document uranium, vanadium, interlayer constituents, water, and unresolved analytical deficits.
- What measured elemental proportions and normalization basis support the proposed margaritasite formula? measurement
- Is hydronium independently supported or inferred, and could impurities explain the apparent deficit? boundary
Structure and hydration Connect crystal-phase evidence with the material's hydration and preparation history.
Diffraction identification
Evaluate structural compatibility and competing phase assignments.
Reference-qualified phase match
Retain the observed pattern, reference origin, matching criteria, and unexplained reflections.
- Which observed reflections and refined parameters support margaritasite over the candidate associated phases? measurement
- Does the comparison reference describe natural margaritasite or a synthetic cesium uranyl-vanadate analogue? provenance
Water and conditioning
Track water content and changes associated with storage or analysis.
Hydration evidence
Record measured hydration without assuming a fixed value for every specimen.
- What water content was measured, under which environmental conditions, and how was adsorbed water distinguished from structural water? measurement
- Did drying, vacuum exposure, or heating change the phase before or during characterization? boundary
Specimen and geological context Locate margaritasite within a physical specimen and preserve its collection history.
Phase distribution
Resolve abundance, associated minerals, and compositional variation at the sampling scale.
Intergrowth and sampling
Distinguish margaritasite domains from adjacent carnotite-like material and matrix.
- Are Cs-rich and K-rich measurements from distinct grains, zoning within grains, or unresolved mixtures? boundary
- Which mapped domain can be sampled to characterize margaritasite with the least interference from associated phases? action
Locality and history
Separate verified collection evidence from geological interpretations.
Occurrence attribution
Link the examined specimen to its documented occurrence without treating locality as proof of identity.
- Which collection records connect this specimen and its subsamples to the stated deposit and geological setting? provenance
- What specimen-specific evidence supports a proposed formation or alteration history? provenance
Condition and operation evidence Record the physical and radiological evidence needed to evaluate proposed work on a uranium-bearing specimen.
Radiological state
Keep measured activity and dose rate distinct from estimates based on ideal composition.
Specimen-specific radiometry
Attach radiological observations to the actual specimen, measurement geometry, and instrument.
- What radionuclide activity or dose-rate measurements exist for this specimen, with what uncertainty and geometry? measurement
- Does any activity estimate assume uranium-series equilibrium or a margaritasite fraction that has not been established? boundary
Particle release and intervention
Relate specimen integrity and contamination observations to the proposed operation.
Operation readiness
Make missing evidence explicit before sampling, grinding, heating, or transferring material.
- Is the margaritasite-bearing material friable or powdery, and what removable-contamination measurements are available? measurement
- What qualified handling assessment and applicable authorization cover the proposed operation on this specimen? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of margaritasite this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of margaritasite this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of margaritasite this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of margaritasite this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of margaritasite this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
Margaritasite is a rare caesium-bearing hydrated uranyl vanadate mineral related to carnotite.
In scope
- Mineral-species identification and its evidential confidence
- Cesium, potassium, hydronium, uranium, vanadium, and water contributions to the mineral formula
- Crystal-phase identification and discrimination from carnotite or mixed phases
- Margaritasite abundance, distribution, and condition within a specimen
- Locality and analytical provenance
- Specimen-specific radiological and contamination measurements
Out of scope
- The complete mineralogy and economic assessment of a uranium deposit
- Uranium extraction, refining, or fuel manufacture
- Carnotite as an independently modeled mineral species
- Synthetic cesium uranyl vanadates treated automatically as natural margaritasite
- General radiation-protection procedures and jurisdiction-wide transport rules
Why it exists Filled
Enable an agent to identify margaritasite, assess the composition and condition of a specimen, and determine which characterization or handling actions its evidence supports.
Distinguishing features Filled
- Test whether cesium predominates over potassium and hydronium in the relevant composition, rather than identifying every cesium-bearing carnotite-like material as margaritasite; this distinction follows the original description summarized by [USGS](https://www.usgs.gov/publications/margaritasite-a-new-mineral-hydrothermal-origin-pena-blanca-uranium-district-mexico).
- Require evidence for a uranyl-vanadate phase consistent with (Cs,K,H3O)2(UO2)2V2O8·nH2O, with n approximately 1 in the original description, rather than merely detecting uranium and cesium in bulk rock.
- Check diffraction compatibility with the reported monoclinic P21/a structure, while distinguishing measurements of natural material from reference data for synthetic analogues.
- Use spatially resolved composition with phase analysis to distinguish a single mineral phase from carnotite-bearing intergrowths or mixtures; [a 2024 study](https://www.mdpi.com/2075-163X/14/4/431) reports both mixed Cs-K compositions and nearly pure cesium uranyl vanadate.
What robots and AI may and may not do Filled
Must not
- Advise storing it in living spaces or within reach of children.
- Advise crushing it or handling it without gloves and hand washing.
- Help ship or sell it without disclosing its radioactivity.
Only with a human decision
- Disposal or cross-border transfer of the specimen.
May
- Describe margaritasite and its relation to carnotite from mineralogical sources.
- Measure and record a specimen's dose rate for its holder.
Moral aspects Filled
- It exposes holders to radiation and toxic vanadium.
- Rare uranium minerals are easily mislabelled, hiding their hazards.
Who is affected
- Collectors and households
- Children
- Transport workers
Owners Filled
Steward
The person or collection that holds a specimen; radiation protection authorities regulate it.
Links to other meta-models Filled
parent
- Q3777653 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.margaritasite
- Wikidata: Q2398230 (https://www.wikidata.org/wiki/Q2398230)
Direct properties required Filled
- Identification status: unexamined | provisional | analytically supported | disputed
- Cesium and potassium proportions: atoms per formula unit, normalization basis, and analytical uncertainty
- Hydronium assignment: directly supported | inferred from charge balance | untested
- Water content: n in ·nH2O and mass %, with temperature, humidity, and method
- Crystal-phase match: observed diffraction pattern linked to a cited natural-mineral or synthetic reference
- Margaritasite phase fraction: mass % or volume %, with method and detection limit
- Specimen integrity: coherent | friable | loose powder | visibly altered | unassessed
- Radiological characterization: Bq/g by identified radionuclide; dose rate in µSv/h with distance, geometry, instrument, and date
- Collection provenance: specimen linked to locality, collection event, accession, and analytical subsamples
Recognition required Filled
- Yellow powdery or fine crystalline coatings like carnotite.
- Confirmed by analysis, since many yellow uranyl vanadates look alike.
Capabilities and actions required Filled
- Assess whether a specimen's chemistry and diffraction support identification as margaritasite.
- Select phase-specific analyses to resolve a margaritasite-carnotite ambiguity.
- Compare compositions while retaining hydration assumptions and analytical uncertainty.
- Map margaritasite-bearing domains before selecting a representative subsample.
- Flag missing radiological or contamination evidence before approving a proposed specimen operation.
Hazards and failure modes required Filled
- Emits ionizing radiation and releases radon.
- Powder is toxic if inhaled or swallowed.
Standards and interfaces required Filled
- IAEA Safety Standards SSR-6, Regulations for the Safe Transport of Radioactive Material, International Atomic Energy Agency.
Context of use required Filled
- Margaritasite is encountered in mineralogical collections and research on uranium-bearing mineral assemblages.
- Specimens are studied to characterize hydrated uranyl vanadates and distinguish related minerals through compositional and structural evidence.
Sources Filled
- Wikidata item Q2398230: margaritasite - identity and sense of the item
- Wikipedia: Margaritasite - general description of the item
Open questions
- What current mineralogical authority defines the margaritasite-carnotite boundary, particularly where hydronium is inferred rather than measured?
- How variable is natural margaritasite's hydration, and which environmental or analytical conditions change its structure?
- Which reference diffraction datasets directly characterize natural margaritasite rather than synthetic analogues?
- Which occurrences beyond the original locality have independently supported species identifications?
- Do authoritative substance identifiers or hazard classifications apply specifically to margaritasite, and how must these be distinguished from classifications of its constituents or host material?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q2398230/spec.json