PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Magnetite is a ferromagnetic mineral with the chemical formula Fe3O4and the common chemical name ferrous-ferric oxide, which indicates the mineral comprises both a ferrous component, FeO (w??stite), and a ferric component, Fe2O3 (hematite).
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  • newworldencyclopedia.org