mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown streak, and earthy to submetallic luster.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown streak, and earthy to submetallic luster.
Formation & geological history
Formed through the secondary alteration and weathering of iron-bearing minerals in sedimentary environments.
Uses & applications
Historically used as a low-grade iron ore and as a yellow-brown pigment in paints called ochre.
Geological facts
Limonite is not a true distinct mineral species, but rather a natural mixture of hydrated iron oxide minerals like goethite and lepidocrocite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and amorphous, earthy masses commonly found in gossans and iron-rich soils.
