mineral
Iron-rich rock, likely limonite/goethite-stained ore
Goethite (α-FeO(OH)) and/or limonite, a mixture of hydrated iron oxides
AI-generated identification · may be incorrectRough, earthy specimen with dark brown to black areas and orange-yellow iron-oxide staining. Goethite is Mohs 5–5.5, typically dull to submetallic, with orthorhombic crystals; the image does not allow reliable determination of composition or specific gravity.
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Physical properties
Rough, earthy specimen with dark brown to black areas and orange-yellow iron-oxide staining. Goethite is Mohs 5–5.5, typically dull to submetallic, with orthorhombic crystals; the image does not allow reliable determination of composition or specific gravity.
Formation & geological history
Forms through oxidation and weathering of iron-bearing minerals, often in soils, veins, and iron-ore deposits; age depends on its host deposit and cannot be inferred from appearance.
Uses & applications
Iron oxides are important iron ores and pigments; attractive pieces may be kept as mineral or rock specimens.
Geological facts
The orange and yellow colors commonly arise from hydrated iron oxides produced during weathering.
Field identification & locations
Look for rusty streaks and earthy coatings; a streak test may yield yellow-brown to reddish-brown powder. Common worldwide in weathered iron deposits; confirm identification with a streak test or mineral analysis.
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