@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix mi: <https://taxonomy.materialinstruments.com/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://taxonomy.materialinstruments.com/id/material/iron-oxide>
  a skos:Concept ;
  skos:inScheme <https://taxonomy.materialinstruments.com/id/axis/material> ;
  skos:prefLabel "Iron oxide"@en ;
  skos:definition "A collective term for the naturally occurring and synthetic oxide compounds of iron, such as haematite and magnetite, used as red, yellow, brown and black mineral pigments."@en ;
  skos:altLabel "iron oxide pigment"@en ;
  skos:broader <https://taxonomy.materialinstruments.com/id/material/mineral-oxide> ;
  skos:closeMatch <http://www.wikidata.org/entity/Q721849> ;
  skos:related <https://taxonomy.materialinstruments.com/id/material/pigment> ;
  mi:relation [ mi:predicate "related-to" ; mi:target <https://taxonomy.materialinstruments.com/id/material/pigment> ] ;
  mi:searchedWithout [ dcterms:date "2026-10-21" ; mi:query "Iron oxide" ; mi:scheme "uniclass" ; mi:via "https://uniclass.thenbs.com/search?query=Iron+oxide&filter=status%3ACurrent" ] ;
  mi:sourceBasis "authored" ;
  dcterms:source "composition dictionary in a materials-retrieval system (src-05); in-house definition" ;
  mi:status "active" .