mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure, specific gravity 2.7-4.3.
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Physical properties
Hardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure, specific gravity 2.7-4.3.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing minerals in sedimentary environments, often found in gossans and iron ore deposits.
Uses & applications
Used historically as a pigment (ochre), a minor ore of iron, and gathered by mineral collectors.
Geological facts
Limonite is not a true mineral species, but rather a mixture of hydrated iron oxide-hydroxides. It often pseudomorphs after other minerals like pyrite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance; common worldwide in weathered iron deposits.
