Minerals & Rocks: Oxides

Oxides form as a result of chemical weathering (by oxygen and water) of iron and aluminum containing minerals:
Composition Formula Mineral name Rock name
iron oxide Fe2O3 Hematite Iron ore
iron oxide Fe3O4 Magnetite/Lodestone Iron ore
hydrated iron oxide 2Fe2O3 & 3H2O Limonite Rust/iron ore
hydrated aluminum oxide Al2O3 & 2H2O Bauxite Aluminum ore
aluminum oxide Al2O3 Corundum Ruby/sapphire


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