a mineral that contains metal that is valuable enough to be mined

a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood

a red or yellow or brown mineral; an oxide of iron that is a common constituent of rust

a greenish grey or black silicate of iron and aluminum

a variety of chert containing magnetite and hematite; mined as a low-grade iron ore

the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form

a red to reddish brown mineral consisting of iron oxide hydroxide; often found in iron ores together with goethite

a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood