mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
Formation & geological history
Forms as a secondary mineral resulting from the weathering and oxidation of iron-bearing minerals in sedimentary or hydrothermal environments.
Uses & applications
Historically used as a pigment (ochre) and historically as a minor ore of iron, though largely replaced today.
Geological facts
Limonite is not a single distinct mineral, but rather a mixture of hydrated iron oxide-hydroxides. It produces a characteristic yellowish-brown streak.
Field identification & locations
Easily identified in the field by its distinct yellowish-brown streak and earthy appearance. Commonly found in gossans and weathered iron deposits worldwide.
