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, and 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, and amorphous crystal structure.
Formation & geological history
Formed through the secondary alteration and weathering of iron-bearing minerals, often in sedimentary environments or gossans.
Uses & applications
Used historically as an iron ore and as a yellow-brown pigment known as ochre.
Geological facts
Limonite is not a true distinct mineral, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance, commonly found worldwide in oxidized iron deposits.
