Limonite
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Limonite is an iron ore consisting of a mixture of hydrated iron oxide-hydroxides in varying composition. The generic formula is frequently written as FeO·nH2O, although this is not entirely accurate
Bog iron ore
Limonite deposited from mine runoff
Galena and limonite
Iron ochre
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Iron ochre or iron ocher is one of several minerals found in iron ore.
Hematite
Goethite