{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.hafnon","code":"thing-q517231","url":"https://ver.cy/models/thing/q517231/","name":"hafnon","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Hafnon is a tetragonal zircon-group mineral with ideal composition HfSiO4, the hafnium-dominant analogue of zircon.","purpose":"Enable an AI agent to recognise hafnon, evaluate the composition and condition of a specimen, and select justified identification, preservation or testing actions.","scope":{"in":["Hafnon identity and its distinction from zircon and other hafnium-bearing phases","Grain-level Hf-Zr composition, substitution and compositional zoning","Crystal structure, phase purity and structural condition","Natural specimen provenance and explicitly labelled synthetic reference materials","Evidence required for sampling, testing and specimen preservation"],"out":["Hafnium metal and hafnium oxide as separate substances","Zircon specimens that do not qualify as hafnon","Host rocks, deposits and mining operations as whole systems","Industrial hafnium extraction and silicate synthesis processes","Manufactured ceramics or devices containing hafnium silicate"],"boundaries":[]},"distinguishingFeatures":["Check composition against the ideal formula HfSiO4; this distinguishes the intended mineral chemistry from hafnium metal or oxide. The formula is recorded in the [IMA mineral list](https://cnmnc.units.it/files/editor/master_list/IMA_Master_List_%282022-07%29.pdf).","Measure Hf and Zr in the same grain domain and apply a documented mineral-naming rule to distinguish hafnon from hafnium-bearing zircon.","Require structural evidence alongside chemistry to distinguish a hafnon phase from an aggregate containing separate hafnium-rich and silica-rich phases.","Establish whether evidence concerns a natural mineral grain or a synthetic hafnium-silicate material before transferring the identification."],"structure":{"bundles":[{"id":"hafnon-identity","name":"Hafnon identity","description":"Establish what evidence makes an analysed domain hafnon.","layers":[{"id":"chemical-assignment","name":"Chemical assignment","description":"Connect measured silicate chemistry to a defensible mineral name.","findings":[{"id":"hafnon-zircon-boundary","name":"Hafnon-zircon boundary","description":"Require domain-level Hf and Zr measurements and an explicit naming authority.","questions":[{"text":"Which authoritative compositional rule separates hafnon from zircon, including compositions close to the boundary?","id":"hafnon-zircon-boundary-q01","kind":"definition"},{"text":"What atomic Hf/(Hf + Zr) and uncertainty were measured in the domain being named?","id":"hafnon-zircon-boundary-q02","kind":"measurement"}]}]},{"id":"structural-confirmation","name":"Structural confirmation","description":"Determine whether the chemistry belongs to the claimed mineral phase.","findings":[{"id":"composition-structure-agreement","name":"Composition-structure agreement","description":"Associate structural measurements with the same material sampled for chemistry.","questions":[{"text":"Which diffraction or complementary structural observations support the hafnon assignment?","id":"composition-structure-agreement-q01","kind":"measurement"},{"text":"Could the apparent composition instead come from unresolved zircon, hafnium oxide or other intergrown phases?","id":"composition-structure-agreement-q02","kind":"boundary"}]}]}]},{"id":"hafnium-distribution","name":"Hafnium distribution","description":"Describe how Hf, Zr and other constituents vary within the specimen.","layers":[{"id":"grain-zoning","name":"Grain zoning","description":"Resolve spatial variation that affects mineral assignment.","findings":[{"id":"domain-representativeness","name":"Domain representativeness","description":"Record whether an analysis represents a core, rim, inclusion-free domain or mixed volume.","questions":[{"text":"How do Hf and Zr vary between the grain core, rim and other resolved domains?","id":"domain-representativeness-q01","kind":"measurement"},{"text":"Does the name hafnon apply to the whole grain, selected domains or only a separated fraction?","id":"domain-representativeness-q02","kind":"boundary"}]}]},{"id":"substitutions-and-inclusions","name":"Substitutions and inclusions","description":"Separate constituents of the mineral from material enclosed in or attached to it.","findings":[{"id":"constituent-attribution","name":"Constituent attribution","description":"Require evidence before assigning minor constituents to the hafnon structure.","questions":[{"text":"Which minor elements are detected, at what concentrations and detection limits?","id":"constituent-attribution-q01","kind":"measurement"},{"text":"What evidence distinguishes structural substitution from inclusions, surface contamination or analytical overlap?","id":"constituent-attribution-q02","kind":"boundary"}]}]}]},{"id":"structure-and-properties","name":"Structure and properties","description":"Evaluate the present state and measured behaviour of the hafnon-bearing material.","layers":[{"id":"structural-integrity","name":"Structural integrity","description":"Record crystallinity and evidence of alteration or damage.","findings":[{"id":"disorder-and-history","name":"Disorder and history","description":"Distinguish observations of disorder from unverified explanations of its cause.","questions":[{"text":"What diffraction peak shapes or other observations quantify structural disorder in this specimen?","id":"disorder-and-history-q01","kind":"measurement"},{"text":"What evidence links its condition to alteration, irradiation, heating or preparation?","id":"disorder-and-history-q02","kind":"provenance"}]}]},{"id":"qualified-property-values","name":"Qualified property values","description":"Attach physical-property measurements to the material and conditions actually tested.","findings":[{"id":"reference-transfer","name":"Reference transfer","description":"Evaluate whether a published or synthetic-reference property is applicable to the specimen.","questions":[{"text":"What density, optical or thermal measurements are available, with units, conditions and measured-versus-calculated status?","id":"reference-transfer-q01","kind":"measurement"},{"text":"Do differences in Zr content, secondary phases or structural condition prevent applying the reference value?","id":"reference-transfer-q02","kind":"boundary"}]}]}]},{"id":"specimen-evidence-and-actions","name":"Specimen evidence and actions","description":"Connect hafnon identification to traceable specimens and justified interventions.","layers":[{"id":"natural-and-synthetic-provenance","name":"Natural and synthetic provenance","description":"Preserve origin and reference-material distinctions.","findings":[{"id":"origin-supported-identity","name":"Origin-supported identity","description":"Link each identity claim to an accessioned specimen or documented synthetic batch.","questions":[{"text":"Which locality, collection accession or synthesis record identifies the material examined?","id":"origin-supported-identity-q01","kind":"provenance"},{"text":"Which claims rely on natural hafnon and which rely on a synthetic analogue?","id":"origin-supported-identity-q02","kind":"boundary"}]}]},{"id":"testing-and-preservation","name":"Testing and preservation","description":"Select actions from the unresolved identity question and the actual specimen condition.","findings":[{"id":"justified-specimen-intervention","name":"Justified specimen intervention","description":"Record the evidential benefit, material consumed and handling basis for a proposed test.","questions":[{"text":"Which next test best resolves the hafnon assignment, and how much material or spatial context would it consume?","id":"justified-specimen-intervention-q01","kind":"action"},{"text":"What specimen-specific dust, contaminant or radiological evidence determines preparation and storage requirements?","id":"justified-specimen-intervention-q02","kind":"action"}]}]}]},{"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.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of hafnon this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe hafnon, its relation to zircon and its occurrence from mineralogical sources.","Record specimens and analyses for an authorized collection."],"mustNot":["Sell zircon or another mineral as hafnon without analysis.","Overstate the hafnium value of specimens or deposits.","Help collect without the landowner's permission."],"requiresHuman":["Confirming a specimen's identity for sale or publication."]},"ethics":{"considerations":["Rare species are often mislabelled in the specimen trade.","Zircon-group minerals may carry some radioactivity that buyers should know about."],"affectedParties":["Collectors and buyers","Researchers"]},"owners":{"steward":"The person or collection that holds a specimen.","roles":[],"masterSystems":[]},"relations":[{"target":"Q3777884","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.hafnon","Wikidata: Q517231 (https://www.wikidata.org/wiki/Q517231)"]},"properties":{"applicability":"required","items":["Domain-level Hf fraction: Atomic Hf/(Hf + Zr), dimensionless, with uncertainty","Analysed formula: Atoms per formula unit, with normalization basis and analytical total","Phase identification: Hafnon supported; zircon supported; other phase; mixed; unresolved","Structural condition: Crystalline; partly disordered; strongly disordered; unmeasured","Composition zoning: Spatial Hf and Zr profiles or maps, with coordinates and resolution in micrometres","Phase purity: Mass or volume fraction, method, detection limit and identified secondary phases","Origin and reference linkage: Natural specimen locality and accession, or synthetic batch and preparation record","Uranium and thorium screening: U and Th concentrations in mg/kg; activity in Bq/kg if measured; method and detection limits"]},"recognition":{"applicability":"required","items":["Small brownish to colourless tetragonal crystals in granitic pegmatites.","Looks like zircon; confirmed only by chemical analysis."]},"capabilities":{"applicability":"required","items":["Assign or withhold a hafnon identification by combining spatially matched composition and structural evidence.","Map Hf-Zr zoning and select representative domains for further analysis.","Compare a specimen with documented natural or synthetic reference material.","Choose minimally destructive tests that resolve the remaining identification uncertainty.","Assess suitability for a proposed measurement from phase purity, structural condition and preparation history.","Set specimen-specific preservation and handling requirements from measured condition and documented hazards."]},"hazards":{"applicability":"required","items":["May contain uranium or thorium traces that make it weakly radioactive."]},"interfaces":{"applicability":"required","items":["The International Mineralogical Association recognizes hafnon as a mineral species through its Commission on New Minerals, Nomenclature and Classification."]},"context":{"applicability":"required","items":["Hafnon is encountered in mineral collections and geological studies of hafnium-rich mineral assemblages, particularly in evolved granitic pegmatites.","Its identification supports research into mineral formation and hafnium distribution, with compositional evidence needed to distinguish it from zircon."]}},"sources":[{"title":"Wikidata item Q517231: hafnon","url":"https://www.wikidata.org/wiki/Q517231","note":"identity and sense of the item"},{"title":"Wikipedia: Hafnon","url":"https://en.wikipedia.org/wiki/Hafnon","note":"general description of the item"}],"openQuestions":["What current authoritative naming rule governs hafnon-zircon intermediate compositions and analyses whose uncertainty crosses the boundary?","Which accessible reference datasets pair verified natural hafnon composition with diffraction or spectroscopic measurements on the same domain?","Which physical and thermal values are established for natural hafnon, and which apply only to synthetic material under specific conditions?","Which CAS, PubChem or EC identifiers, if any, unambiguously represent hafnon rather than a broader hafnium-silicate substance or commercial mixture?","What hafnon-specific evidence supports hazard classification, exposure guidance and interpretation of U-Th content or structural damage?"],"resources":{"spec":"/models/things/publications/thing-q517231/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q517231/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:09:36Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}