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, and a yellowish-brown streak.
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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, and a yellowish-brown streak.
Formation & geological history
Forms as a secondary mineral resulting from the oxidation of various iron-bearing minerals in weathering environments and sedimentary deposits.
Uses & applications
Historically used as a low-grade iron ore and as a natural pigment for yellow and brown ochre paints.
Geological facts
Limonite is not a single mineral, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified easily in the field by its characteristic yellowish-brown streak and earthy appearance; commonly found in gossans and weathered iron deposits worldwide.
