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Identifying Goethite and Hematite in the Field

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Identifying Goethite and Hematite in the Field

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Goethite, hematite and magnetite are the primary minerals for iron ore. They are iron oxides. Goethite has the chemical formula of FeO(OH) while hematite’s formula is Fe2O3 . Goethite typically has a yellow or brown color while hematite is typically red. Goethite is an iron oxyhydroxide. The formation of goethite is marked by the oxidation state change of Fe2+ (ferrous) to Fe3+ (ferric) iron, which allows for goethite to exist at the earth’s surface. Hematite is one of the most abundant minerals and is found in sedimentary, metamorphic, and igneous rocks.

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