{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.francevillite","code":"thing-q1065441","url":"https://ver.cy/models/thing/q1065441/","name":"francevillite","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":"Francevillite is a radioactive, hydrated barium-lead uranyl vanadate mineral, commonly represented by (Ba,Pb)(UO2)2(VO4)2·5H2O, that occurs as a secondary mineral in oxidized uranium deposits.","purpose":"Enable an agent to recognise francevillite, assess the identity and condition of a specimen, and determine which analytical, storage or transfer actions its evidence supports.","scope":{"in":["Francevillite identity and its compositional relationship to curienite","Grain-specific chemistry, structural evidence and identification confidence","Francevillite abundance, intergrowths and host-matrix relationships","Hydration, alteration and physical condition of the identified phase","Specimen provenance and evidence supporting permitted examination or movement"],"out":["Curienite and other associated minerals as independent species models","Uranium or vanadium deposits, reserves and mining operations","Industrial uranium extraction and ore-processing methods","Commercial products containing uranium, barium or vanadium compounds","Radiation instruments and jurisdiction-wide regulatory systems"],"boundaries":[]},"distinguishingFeatures":["Require grain-specific chemistry compatible with a barium-bearing hydrated uranyl vanadate; the reported francevillite composition permits lead substitution and does not require lead to be present. [Cesbron and Morin, 1968](https://www.persee.fr/doc/bulmi_0037-9328_1968_num_91_5_6260)","Resolve francevillite versus curienite through measured Ba/Pb site composition and an explicitly sourced species-boundary rule, rather than colour or locality; the two are treated as a mineral series. [Cesbron and Morin, 1968](https://www.persee.fr/doc/bulmi_0037-9328_1968_num_91_5_6260)","Require diffraction consistent with francevillite as well as compatible chemistry, so a mixture containing separate barium and uranium minerals cannot pass as a single francevillite phase.","Use colour only as supporting evidence: reported francevillite colours span yellow, orange, green and brown, while its reported structure is orthorhombic. [Handbook of Mineralogy](https://www.handbookofmineralogy.org/pdfs/francevillite.pdf)"],"structure":{"bundles":[{"id":"species-and-composition","name":"Species and composition","description":"Establish what makes the registered thing francevillite and how measured composition supports that name.","layers":[{"id":"formula-evidence","name":"Formula evidence","description":"Separate an ideal mineral formula from the composition measured on a particular grain.","findings":[{"id":"hydrated-uranyl-vanadate-identity","name":"Hydrated uranyl vanadate identity","description":"Francevillite is reported as (Ba,Pb)(UO2)2(VO4)2·5H2O; the model must distinguish that reference composition from analytical results and inferred water content. [Cesbron and Morin, 1968](https://www.persee.fr/doc/bulmi_0037-9328_1968_num_91_5_6260)","questions":[{"text":"Which cited formula convention defines francevillite, and which constituents can substitute without changing the species assignment?","id":"hydrated-uranyl-vanadate-identity-q01","kind":"definition"},{"text":"What grain-specific analysis supports the formula, and which components were calculated rather than measured?","id":"hydrated-uranyl-vanadate-identity-q02","kind":"measurement"}]}]},{"id":"curienite-boundary","name":"Curienite boundary","description":"Assess the species assignment where barium and lead share the relevant compositional position.","findings":[{"id":"ba-pb-assignment","name":"Ba/Pb assignment","description":"Record composition, zoning and uncertainty before applying a sourced francevillite-curienite naming criterion.","questions":[{"text":"Which current nomenclatural rule assigns this composition to francevillite rather than curienite?","id":"ba-pb-assignment-q01","kind":"boundary"},{"text":"Do mapped Ba/Pb values indicate one composition, zoned grains or distinct intergrown phases?","id":"ba-pb-assignment-q02","kind":"measurement"}]}]}]},{"id":"phase-recognition","name":"Phase recognition","description":"Connect the francevillite assignment to structural measurements and spatially located observations.","layers":[{"id":"structural-confirmation","name":"Structural confirmation","description":"Evaluate diffraction against an identified reference and account for conflicting evidence.","findings":[{"id":"reference-pattern-match","name":"Reference pattern match","description":"Preserve the measured diffraction pattern, reference identity and interpretation rather than recording only a successful match.","questions":[{"text":"Which measured reflections and cell parameters support a francevillite assignment?","id":"reference-pattern-match-q01","kind":"measurement"},{"text":"Which reference dataset was used, and what sample composition and measurement conditions does it represent?","id":"reference-pattern-match-q02","kind":"provenance"},{"text":"Could unexplained reflections indicate curienite, another associated phase or transformation during analysis?","id":"reference-pattern-match-q03","kind":"boundary"}]}]},{"id":"grain-level-recognition","name":"Grain-level recognition","description":"Locate observations and analyses on the specimen so evidence from neighbouring phases is not combined.","findings":[{"id":"same-grain-evidence","name":"Same-grain evidence","description":"Tie microscopy, chemistry and structural evidence to the same grain or explicitly defined sampled region.","questions":[{"text":"Which photographed grain or mapped region supplied each chemical and structural measurement?","id":"same-grain-evidence-q01","kind":"provenance"},{"text":"Can the analytical footprint include matrix or an adjacent uranium or barium mineral?","id":"same-grain-evidence-q02","kind":"boundary"}]}]}]},{"id":"specimen-state-and-context","name":"Specimen state and context","description":"Represent the condition and geological context of the francevillite-bearing material.","layers":[{"id":"hydrate-preservation","name":"Hydrate preservation","description":"Track environmental and analytical histories that might affect the hydrated phase.","findings":[{"id":"phase-change-evidence","name":"Phase-change evidence","description":"Record observed changes and leave unmeasured stability limits unresolved.","questions":[{"text":"What temperature, humidity, vacuum or irradiation conditions preceded the present observation?","id":"phase-change-evidence-q01","kind":"provenance"},{"text":"What repeat diffraction, spectroscopy or water-loss measurement distinguishes retained francevillite from an altered phase?","id":"phase-change-evidence-q02","kind":"measurement"},{"text":"Which examination conditions are supported by evidence of phase preservation?","id":"phase-change-evidence-q03","kind":"action"}]}]},{"id":"occurrence-and-mixture","name":"Occurrence and mixture","description":"Separate locality evidence and geological association from direct species identification.","findings":[{"id":"documented-mineral-occurrence","name":"Documented mineral occurrence","description":"Record the specimen's collection history, matrix, associated phases and measured francevillite fraction without treating locality as proof.","questions":[{"text":"Which collection record or publication supports the stated locality and specimen history?","id":"documented-mineral-occurrence-q01","kind":"provenance"},{"text":"How much of the examined material is identified francevillite, and how was that fraction determined?","id":"documented-mineral-occurrence-q02","kind":"measurement"}]}]}]},{"id":"uranium-bearing-specimen-actions","name":"Uranium-bearing specimen actions","description":"Connect the specimen's uranium-bearing composition, physical integrity and measured condition to decisions about examination and custody.","layers":[{"id":"exposure-and-particle-evidence","name":"Exposure and particle evidence","description":"Keep instrument observations, removable particles and chemical composition distinct.","findings":[{"id":"specimen-specific-assessment","name":"Specimen-specific assessment","description":"Require documented assessment of the actual specimen before interpreting its handling constraints.","questions":[{"text":"What radiological measurements exist, with which instrument, calibration, geometry and background?","id":"specimen-specific-assessment-q01","kind":"measurement"},{"text":"Is the francevillite-bearing surface intact or shedding material, and what evidence establishes that state?","id":"specimen-specific-assessment-q02","kind":"measurement"},{"text":"Which proposed examination or sampling actions are supported by the recorded assessment?","id":"specimen-specific-assessment-q03","kind":"action"}]}]},{"id":"custody-and-transfer","name":"Custody and transfer","description":"Link the mineral specimen to the applicable external decisions about storage, transport or disposal.","findings":[{"id":"action-specific-classification","name":"Action-specific classification","description":"Record verified identifiers and applicable determinations without borrowing classifications from different uranium compounds.","questions":[{"text":"Which jurisdiction, activity and specimen measurements govern the proposed storage or transfer decision?","id":"action-specific-classification-q01","kind":"boundary"},{"text":"What documented determination and packaging or custody conditions support that action?","id":"action-specific-classification-q02","kind":"action"},{"text":"Does any cited chemical identifier or hazard record actually cover francevillite rather than another uranium-bearing substance?","id":"action-specific-classification-q03","kind":"provenance"}]}]}]},{"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 francevillite 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 francevillite 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 francevillite this model covers, and on what evidence?","id":"evidence-real-world-use-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 francevillite this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of francevillite this model covers, and on what evidence?","id":"evidence-regional-variation-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 francevillite this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe francevillite and its occurrence in oxidized uranium deposits from mineralogical sources.","Measure and record a specimen's dose rate for its holder."],"mustNot":["Advise storing it in living or sleeping areas 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."],"requiresHuman":["Disposal or cross-border transfer of the specimen."]},"ethics":{"considerations":["It exposes holders to radiation, and its lead and vanadium add chemical toxicity.","Buyers who are not told of the hazard cannot protect their families."],"affectedParties":["Collectors and households","Children","Transport workers"]},"owners":{"steward":"The person or collection that holds a specimen; radiation protection authorities regulate it.","roles":[],"masterSystems":[]},"relations":[{"target":"Q2624432","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.francevillite","Wikidata: Q1065441 (https://www.wikidata.org/wiki/Q1065441)"]},"properties":{"applicability":"required","items":["Analysed mineral formula: Atoms per formula unit, normalization basis and analytical uncertainty","Barium versus lead occupancy: Ba and Pb atoms per formula unit; molar Ba/(Ba+Pb), with uncertainty","Diffraction identification: Measured pattern linked to a cited francevillite reference, matching method and residual unexplained reflections","Hydration condition: Unmeasured, consistent with reference hydrate, suspected water loss or confirmed transformation; associated temperature and humidity","Francevillite fraction: Mass percent or mapped area percent, explicitly distinguished and accompanied by method and uncertainty","Grain and matrix association: Mapped francevillite grains linked to neighbouring phases, matrix and analytical spots","Surface integrity: Intact, fractured, friable, shedding particles or unknown","Radiological survey evidence: Instrument-appropriate count rate, dose rate or activity units, with geometry, background, calibration and date","Identification status: Label-only, visually tentative, chemically supported, structurally supported or jointly confirmed"]},"recognition":{"applicability":"required","items":["Bright yellow scaly crystals or crusts on sandstone or uranium ore.","Resembles other yellow uranyl vanadates; confirmed by analysis."]},"capabilities":{"applicability":"required","items":["Compare grain chemistry and diffraction with cited francevillite references and record a qualified identification.","Flag Ba/Pb compositions requiring review against the curienite boundary.","Map francevillite separately from matrix and associated mineral phases before interpreting bulk analyses.","Compare successive observations for particle shedding, water loss or phase transformation.","Select examination or sampling actions using specimen condition and documented radiological assessment.","Assemble specimen evidence for a jurisdiction-specific storage or transfer decision."]},"hazards":{"applicability":"required","items":["Emits ionizing radiation and releases radon.","Powder is toxic if inhaled or swallowed."]},"interfaces":{"applicability":"required","items":["IAEA Safety Standards SSR-6, Regulations for the Safe Transport of Radioactive Material, International Atomic Energy Agency."]},"context":{"applicability":"required","items":["Francevillite is encountered in oxidized uranium deposits and in mineral collections containing secondary uranium minerals.","Researchers examine it to identify mineral assemblages and understand uranium and vanadium behavior during weathering.","Museum and collection work also considers its radioactive composition when documenting, storing or transferring specimens."]}},"sources":[{"title":"Wikidata item Q1065441: francevillite","url":"https://www.wikidata.org/wiki/Q1065441","note":"identity and sense of the item"},{"title":"Wikipedia: Francevillite","url":"https://en.wikipedia.org/wiki/Francevillite","note":"general description of the item"}],"openQuestions":["What current authoritative nomenclature and site-occupancy rule should resolve borderline francevillite-curienite compositions?","Which reference diffraction and spectroscopic datasets best distinguish francevillite from closely related or intergrown uranyl vanadates?","What experimentally established temperature, humidity and vacuum limits preserve francevillite, and which phases form when it changes?","Which CAS, PubChem or EC identifiers, if any, unambiguously cover the mineral species, and are any hazard classifications specifically applicable to it?","Does the existing Vercy world-model catalogue already cover francevillite, requiring vr.tr.francevillite to link to that publication?"],"resources":{"spec":"/models/things/publications/thing-q1065441/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1065441/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T09:52:06Z","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 2026-10-07T10:10:25+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}