Group: Oxide

Mineral: Hematite

Chemical Composition: Fe3O4

Common Characteristics: Red to silver-gray color, type of iron ore

Mineral: Magnetite

Chemical Composition: Fe3O4

Common Characteristics: Black with metallic luster; magnetic

Mineral: Corundum

Chemical Composition: Al2O3

Common Characteristics: Red to silver-gray color; type of iron ore