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 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 luster, amorphous crystal structure.
Formation & geological history
Formed as a secondary mineral through the weathering and oxidation of various iron-bearing minerals in sedimentary environments.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment called ochre.
Geological facts
Limonite is not a true single mineral, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance; commonly found in gossans above sulfide ore deposits.
