{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.iridium","code":"thing-q877","url":"https://ver.cy/models/thing/q877/","name":"iridium","alternateNames":["iridium-164","iridium-164m","iridium-165","iridium-165m","iridium-166","iridium-166m","iridium-167","iridium-167m","iridium-168","iridium-168m","iridium-169","iridium-169m"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"The chemical element with atomic number seventy-seven, a very hard, brittle, dense platinum group metal that is the most corrosion-resistant metal known, with two stable isotopes and many radioactive isotopes, occurring in platinum ores and in unusually high concentration in the geological layer marking the asteroid impact at the end of the Cretaceous; iridium is used in spark plugs, crucibles, electrical contacts, medical devices and, as iridium-192, in radiotherapy and industrial radiography.","purpose":"Let an agent explain iridium as an element and its properties, describe uses and isotopes, explain its role as evidence of the Cretaceous impact, and support learning.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Extreme corrosion resistance","High density","Platinum group","Impact layer marker"],"structure":{"bundles":[{"id":"understand","name":"Understand","description":"What iridium is.","layers":[{"id":"element","name":"Element","description":"The element.","findings":[{"id":"element-finding","name":"Element","description":"Element.","questions":[{"text":"What are the properties of iridium, and how does it relate to other platinum group metals?","kind":"definition"},{"text":"Which entry fits platinum group metals?","kind":"action"}]}]},{"id":"isotopes","name":"Isotopes","description":"Isotopes.","findings":[{"id":"isotopes-finding","name":"Isotopes","description":"Isotopes.","questions":[{"text":"What isotopes of iridium exist, and why is iridium-192 important?","kind":"definition"},{"text":"Which entry fits radioisotopes?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Uses.","layers":[{"id":"industrial","name":"Industrial","description":"Industrial uses.","findings":[{"id":"industrial-finding","name":"Industrial","description":"Industrial.","questions":[{"text":"How is iridium used in spark plugs, crucibles, contacts, catalysts and electronics?","kind":"provenance"},{"text":"Which entry fits a specific application?","kind":"action"}]}]},{"id":"medical","name":"Medical","description":"Medical and radiographic uses.","findings":[{"id":"medical-finding","name":"Medical","description":"Medical.","questions":[{"text":"How is iridium-192 used in radiotherapy and radiography, and how is it regulated?","kind":"provenance"},{"text":"Is a radiation safety concern present now, requiring authorities?","kind":"boundary"}]}]}]},{"id":"science","name":"Science","description":"Iridium in geology.","layers":[{"id":"anomaly","name":"Anomaly","description":"The iridium anomaly.","findings":[{"id":"anomaly-finding","name":"Anomaly","description":"Anomaly.","questions":[{"text":"How did the iridium layer at the Cretaceous boundary support the impact hypothesis?","kind":"provenance"},{"text":"Which entry fits the Cretaceous extinction?","kind":"action"}]}]},{"id":"sources","name":"Sources","description":"Sources and supply.","findings":[{"id":"sources-finding","name":"Sources","description":"Sources.","questions":[{"text":"Where is iridium obtained, and how is supply organised?","kind":"provenance"},{"text":"Which entry fits mining?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"History and teaching.","layers":[{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How was iridium discovered and named?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can iridium illustrate chemistry and earth science topics?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Explain iridium's properties, isotopes and uses in crucibles, spark plugs and electrodes.","Report published data on its scarcity and recycling."],"mustNot":["Describe radioactive iridium sources as safe to handle outside licensed control.","Help divert licensed radioactive sources from their keepers.","Misrepresent the purity or origin of precious metal for sale."],"requiresHuman":["Responding to a found or lost industrial radiation source."]},"ethics":{"considerations":["Lost industrial radiography sources have injured people who found them.","Platinum group metal mining affects workers and communities."],"affectedParties":["Workers handling sources","Members of the public","Mining communities"]},"owners":{"steward":"Nobody owns the element; holders answer for their material and radiation regulators license sources.","roles":[],"masterSystems":["Radioactive source registers of national regulators"]},"relations":[{"target":"Q105789","type":"parent","note":"registry parent class"},{"target":"Q223995","type":"parent","note":"registry parent class"},{"target":"platinum group","type":"related","note":"category"},{"target":"heavy metal","type":"related","note":"category"},{"target":"tantalum","type":"related","note":"another metal entry"},{"target":"impact crater","type":"related","note":"impact evidence"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.iridium","Wikidata: Q877 (https://www.wikidata.org/wiki/Q877)"]},"properties":{"applicability":"required","items":["Density: Approximately 22.6 g/cm3 - This approximate value describes solid iridium near room temperature.","Melting temperature: Approximately 2719 K - This approximate value describes pure iridium at ordinary atmospheric pressure.","Molar mass: Approximately 192.2 g/mol - This value describes iridium with its natural isotopic composition."]},"recognition":{"applicability":"required","items":["Atomic number seventy-seven","Most corrosion-resistant metal","Platinum and osmium are neighbouring platinum group metals","A silvery-white, very hard and dense metal."]},"capabilities":{"applicability":"required","items":["explain the element","describe uses and isotopes","explain the impact evidence","support learning"]},"hazards":{"applicability":"required","items":["Radiation hazards from lost iridium-192 sources","Confusing platinum group metals","Supply concentration"]},"interfaces":{"applicability":"required","items":["Radiation protection rules for iridium-192 sources","Materials standards for alloys","Precious metal trading standards"]},"context":{"applicability":"required","items":["Element seventy-seven, a platinum group metal.","iridium metal and alloys","iridium isotopes including iridium-192","iridium compounds","iridium in catalysis and electronics","iridium in the Cretaceous boundary layer"]}},"sources":[{"title":"Wikidata item Q877: iridium","url":"https://www.wikidata.org/wiki/Q877","note":"identity and sense of the item"},{"title":"Wikipedia: Iridium","url":"https://en.wikipedia.org/wiki/Iridium","note":"general description of the item"}],"openQuestions":["Should iridium-192 be a separate entry?","How should radiation safety be linked?","How should the impact hypothesis be linked?"],"resources":{"spec":"/models/things/publications/thing-q877/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q877/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T03:07:45Z","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 2026-10-07T10:10:33+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}