{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.magnesioferrite","code":"thing-q408603","url":"https://ver.cy/models/thing/q408603/","name":"magnesioferrite","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":"Magnesioferrite is a cubic oxide mineral of the spinel group with ideal composition MgFe₂O₄, in which magnesium and ferric iron occupy the cation sites of a spinel structure.","purpose":"Enable an agent to identify magnesioferrite, assess a specimen's composition and physical state, and determine which handling or material-use decisions its evidence supports.","scope":{"in":["Mineral identity and boundaries with neighbouring spinel species and MgFe2O4 polymorphs","Measured composition, iron oxidation states, substitutions, and phase purity","Crystal structure, cation site occupancy, and thermal history","Specimen morphology and condition-dependent magnetic and physical properties","Natural occurrence or synthetic provenance, handling evidence, and suitability for a specified use"],"out":["Magnetite, maghemite, and other ferrite species as independent materials","Maohokite as a separate mineral species","Host rocks, deposits, and geological events beyond their relation to a specimen","Synthesis processes and processing equipment as independently managed systems","Devices, catalysts, and commercial formulations containing magnesium ferrite"],"boundaries":[]},"distinguishingFeatures":["Establish Mg-bearing ferric oxide chemistry together with spinel structure; chemistry alone does not establish mineral identity. Reference: [Handbook of Mineralogy: Magnesioferrite](https://www.handbookofmineralogy.org/pdfs/magnesioferrite.pdf).","Distinguish magnesioferrite from magnetite using quantified Mg and iron oxidation-state evidence, rather than magnetic attraction alone; the minerals form a compositional series. Reference: [Handbook of Mineralogy: Magnesioferrite](https://www.handbookofmineralogy.org/pdfs/magnesioferrite.pdf).","Distinguish cubic magnesioferrite from orthorhombic maohokite through structural analysis, because both have ideal formula MgFe2O4. Reference: [Handbook of Mineralogy: Maohokite](https://www.handbookofmineralogy.org/pdfs/Maohokite.pdf).","Require evidence that Mg and Fe belong to the identified spinel phase; a bulk mixture of magnesium-bearing material and iron oxide can misleadingly approach the same elemental ratio.","Treat a supplier label of 'magnesium ferrite' as a candidate identification requiring phase and composition evidence, particularly for doped powders and multiphase products."],"structure":{"bundles":[{"id":"mineral-identity","name":"Mineral identity","description":"Establish whether the material belongs to the registered magnesioferrite concept.","layers":[{"id":"species-boundary","name":"Species boundary","description":"Connect the registered name to a defensible mineral identification.","findings":[{"id":"magnesioferrite-assignment","name":"Magnesioferrite assignment","description":"Require compatible composition and structure and state the nomenclature rule used.","questions":[{"text":"Which accepted mineral definition and compositional naming rule support assigning this specimen to magnesioferrite?","id":"magnesioferrite-assignment-q01","kind":"definition"},{"text":"Does 'magnesium ferrite' identify this phase, a synthetic analogue, or a product containing it?","id":"magnesioferrite-assignment-q02","kind":"boundary"}]}]},{"id":"competing-identifications","name":"Competing identifications","description":"Resolve similar spinels, polymorphs, and misleading mixtures.","findings":[{"id":"discriminating-evidence","name":"Discriminating evidence","description":"Assess whether the available analytical evidence separates plausible alternatives.","questions":[{"text":"Which phase-specific Mg and iron-valence measurements distinguish the specimen from Mg-bearing magnetite or other iron oxides?","id":"discriminating-evidence-q01","kind":"measurement"},{"text":"Which diffraction evidence excludes maohokite and a mixture of separate magnesium and iron compounds?","id":"discriminating-evidence-q02","kind":"boundary"}]}]}]},{"id":"composition-and-phase-purity","name":"Composition and phase purity","description":"Describe the actual magnesioferrite composition and its share of the material.","layers":[{"id":"formula-and-valence","name":"Formula and valence","description":"Record analytical chemistry with explicit normalization and oxidation-state assumptions.","findings":[{"id":"measured-formula","name":"Measured formula","description":"Separate directly measured quantities from charge-balance calculations.","questions":[{"text":"What formula follows from phase-specific Mg, Fe, and substituent measurements, including analytical uncertainty?","id":"measured-formula-q01","kind":"measurement"},{"text":"Was Fe2+/Fe3+ measured independently or inferred from stoichiometry, and what assumptions govern that inference?","id":"measured-formula-q02","kind":"provenance"}]}]},{"id":"heterogeneity-and-accessories","name":"Heterogeneity and accessories","description":"Separate substitutions within grains from additional mineral or manufactured phases.","findings":[{"id":"phase-resolved-purity","name":"Phase-resolved purity","description":"Define purity through identified phases and spatially resolved composition.","questions":[{"text":"What fraction is magnesioferrite, and which crystalline or amorphous accessory phases remain detectable?","id":"phase-resolved-purity-q01","kind":"measurement"},{"text":"Are compositional deviations located within magnesioferrite grains, in zoning, or in inclusions and surface coatings?","id":"phase-resolved-purity-q02","kind":"boundary"}]}]}]},{"id":"structure-and-transformation","name":"Structure and transformation","description":"Record spinel structure, cation ordering, and changes under treatment.","layers":[{"id":"lattice-and-site-occupancy","name":"Lattice and site occupancy","description":"Link structural measurements to specimen conditions and refinement assumptions.","findings":[{"id":"resolved-spinel-state","name":"Resolved spinel state","description":"Represent the measured lattice and the evidence available for Mg and Fe site distribution.","questions":[{"text":"What diffraction refinement supports the assigned spinel structure and lattice parameters at the stated temperature?","id":"resolved-spinel-state-q01","kind":"measurement"},{"text":"What method constrains Mg and Fe occupancy, and is an inversion parameter identifiable within its uncertainty?","id":"resolved-spinel-state-q02","kind":"measurement"}]}]},{"id":"treatment-dependent-state","name":"Treatment-dependent state","description":"Track structural or chemical changes through thermal, atmospheric, and pressure exposure.","findings":[{"id":"verified-transformation-envelope","name":"Verified transformation envelope","description":"Distinguish observed stability from extrapolated treatment limits.","questions":[{"text":"What annealing, cooling, pressure, and atmosphere history preceded the current measurements?","id":"verified-transformation-envelope-q01","kind":"provenance"},{"text":"Which measurements establish the onset of ordering changes, redox changes, decomposition, or a different structure?","id":"verified-transformation-envelope-q02","kind":"measurement"},{"text":"After a proposed treatment, which phase and composition checks are required before retaining the magnesioferrite identification?","id":"verified-transformation-envelope-q03","kind":"action"}]}]}]},{"id":"specimen-properties","name":"Specimen properties","description":"Make physical and magnetic measurements comparable across magnesioferrite forms.","layers":[{"id":"morphology-and-physical-response","name":"Morphology and physical response","description":"Describe grain dimensions, aggregation, porosity, and supporting identification properties.","findings":[{"id":"physical-measurement-context","name":"Physical measurement context","description":"Attach measured properties to the actual specimen scale and material form.","questions":[{"text":"What are the particle, aggregate, and crystallite-size distributions, and how were they distinguished?","id":"physical-measurement-context-q01","kind":"measurement"},{"text":"Do density, hardness, and optical observations describe magnesioferrite grains or a porous, coated, or multiphase specimen?","id":"physical-measurement-context-q02","kind":"boundary"}]}]},{"id":"magnetic-characterization","name":"Magnetic characterization","description":"Record magnetic response with sufficient context to support a decision.","findings":[{"id":"conditioned-magnetic-response","name":"Conditioned magnetic response","description":"Separate the measured specimen response from an assumed universal material constant.","questions":[{"text":"What magnetization curve, coercivity, and remanence were measured at the stated temperature and field protocol?","id":"conditioned-magnetic-response-q01","kind":"measurement"},{"text":"How were accessory magnetic phases and the magnesioferrite mass fraction accounted for?","id":"conditioned-magnetic-response-q02","kind":"measurement"},{"text":"Does the measured response support the proposed separation or magnetic-material requirement?","id":"conditioned-magnetic-response-q03","kind":"action"}]}]}]},{"id":"origin-handling-and-use","name":"Origin, handling, and use","description":"Connect specimen provenance to defensible handling and use decisions.","layers":[{"id":"specimen-lineage","name":"Specimen lineage","description":"Preserve origin and treatment records needed to interpret the material.","findings":[{"id":"natural-or-synthetic-lineage","name":"Natural or synthetic lineage","description":"Identify the specimen's source and distinguish observed context from inferred formation.","questions":[{"text":"Which locality, host association, or manufacturing lot identifies the origin of this magnesioferrite specimen?","id":"natural-or-synthetic-lineage-q01","kind":"provenance"},{"text":"Which formation or processing conditions are documented, and which are inferred from mineral associations or the current structure?","id":"natural-or-synthetic-lineage-q02","kind":"provenance"}]}]},{"id":"handling-and-acceptance","name":"Handling and acceptance","description":"Tie permissions for handling or use to the characterized material form.","findings":[{"id":"material-specific-decision","name":"Material-specific decision","description":"Avoid transferring identifiers, safety classifications, or performance claims between unlike materials.","questions":[{"text":"Which verified CAS, EC, or PubChem records apply to this material identity, and do they describe the mineral, synthetic compound, or formulation?","id":"material-specific-decision-q01","kind":"boundary"},{"text":"What current documentation supports handling controls for this powder or specimen, including identified accessory contaminants?","id":"material-specific-decision-q02","kind":"provenance"},{"text":"Which measured phase-purity, particle-size, and magnetic criteria must be satisfied before accepting this specimen for the proposed use?","id":"material-specific-decision-q03","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 magnesioferrite 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 magnesioferrite 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 magnesioferrite 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 magnesioferrite 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 magnesioferrite 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 magnesioferrite this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe magnesioferrite, its spinel structure and occurrence from mineralogical sources.","Record its magnetic and compositional data with stated methods."],"mustNot":["Confuse it with magnetite or other spinels in reports without analysis.","Help collect specimens from protected sites, such as volcanic or burning coal areas, without permission.","Make health or healing claims about magnetic mineral specimens."],"requiresHuman":["Confirming a specimen's identity for sale or publication."]},"ethics":{"considerations":["Misidentification of minerals misleads buyers and corrupts research data.","Some localities are hazardous or protected sites."],"affectedParties":["Collectors and buyers","Researchers"]},"owners":{"steward":"The person or collection that holds a specimen.","roles":[],"masterSystems":[]},"relations":[{"target":"Q1290820","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.magnesioferrite","Wikidata: Q408603 (https://www.wikidata.org/wiki/Q408603)"]},"properties":{"applicability":"required","items":["Identification status: candidate; analytically supported; disputed; unresolved","Phase-specific composition: Mg, Fe, and substituent concentrations in wt%; formula normalized to four oxygen atoms with assumptions recorded","Iron oxidation-state partition: Fe2+/total Fe and Fe3+/total Fe; method and uncertainty","Crystal phase and lattice: identified structure and space group; lattice parameters in angstroms; measurement temperature","Cation inversion parameter: x from 0 to 1 under the explicitly stated idealized convention (Mg1-xFex)[MgxFe2-x]O4","Magnesioferrite phase fraction: wt% or vol%, with method, uncertainty, and detection limits","Particle and crystallite dimensions: nm or micrometres; separate particle, aggregate, and coherent-domain distributions","Magnetic response: magnetization in A m2/kg; coercivity in A/m; temperature, field protocol, and normalization basis","Thermal and atmospheric history: linked annealing, cooling, storage, and exposure records with temperature, duration, and atmosphere","Origin and material form: natural crystal; natural aggregate; mineral inclusion; synthetic analogue powder; ceramic; film","Applicable handling evidence: specimen or product-specific safety documentation, exposure assessment, jurisdiction, and review date"]},"recognition":{"applicability":"required","items":["Black, metallic, strongly magnetic octahedral crystals or grains.","Very similar to magnetite; told apart by chemical analysis."]},"capabilities":{"applicability":"required","items":["Select complementary composition and diffraction measurements to resolve a candidate identification.","Compare a specimen with magnesioferrite references while accounting for substitutions and accessory phases.","Track changes after heating, milling, or atmospheric exposure through before-and-after measurements.","Evaluate magnetic separation or collection using measured response and the identity of coexisting phases.","Assess a characterized specimen against explicit magnetic, purity, and particle-size requirements.","Choose handling controls from material-form and contaminant evidence."]},"hazards":{"applicability":"required","items":["Collecting at fumaroles or burning coal dumps exposes collectors to heat and gases."]},"interfaces":{"applicability":"required","items":["The mineral classification approved by the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification places magnesioferrite in the spinel supergroup."]},"context":{"applicability":"required","items":["Magnesioferrite is encountered in mineral collections and geological studies of magnesium-rich rocks altered by heat or associated with volcanic environments.","Its composition and crystal structure help researchers interpret mineral formation and distinguish related spinel minerals.","Synthetic magnesium ferrite materials are also studied for magnetic and catalytic behaviour, although their properties need not match those of natural specimens."]}},"sources":[{"title":"Wikidata item Q408603: magnesioferrite","url":"https://www.wikidata.org/wiki/Q408603","note":"identity and sense of the item"},{"title":"Wikipedia: Magnesioferrite","url":"https://en.wikipedia.org/wiki/Magnesioferrite","note":"general description of the item"}],"openQuestions":["Which current mineral nomenclature rules resolve substituted compositions near the magnesioferrite-magnetite boundary?","Which chemical identifiers map precisely to magnesioferrite, and which describe broader synthetic magnesium ferrite materials?","What composition-, size-, and treatment-specific evidence constrains cation inversion and magnetic properties?","What verified temperature, pressure, and atmosphere limits establish phase persistence, and should any reported melting value instead be treated as decomposition or transformation?","Which authoritative safety classifications and exposure limits apply to particular magnesioferrite material forms, rather than being borrowed from unrelated iron oxides or contaminants?"],"resources":{"spec":"/models/things/publications/thing-q408603/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q408603/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T11:07:22Z","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 2026-10-07T10:10:30+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}