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
Formed as a secondary mineral through the weathering and oxidation of iron-rich minerals, often in sedimentary environments or gossans.
Uses & applications
Historically used as a low-grade iron ore and pigment (ochre), and collected as a mineral specimen.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related iron oxides and hydroxides like goethite and lepidocrocite.
Field identification & locations
Easily identified by its characteristic yellowish-brown streak and earthy appearance; found globally in weathered iron deposits.
