mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown streak, submetallic to 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 streak, submetallic to earthy luster, amorphous crystal structure.
Formation & geological history
Formed through the weathering and oxidation of iron-bearing minerals in sedimentary environments or hydrothermal veins.
Uses & applications
Historically used as a low-grade iron ore and as a yellow pigment (ochre) in paints.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrous iron oxides like goethite and akaganeite.
Field identification & locations
Commonly identified by its characteristic yellowish-brown streak and earthy texture; frequently found in iron-rich sedimentary deposits.
