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, and 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, and amorphous crystal structure.
Formation & geological history
Formed through the secondary alteration and weathering of iron-bearing minerals, commonly found in gossans and sedimentary iron deposits.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment for paints known as ochre.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related hydrated iron oxides, primarily goethite and lepidocrocite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance. Found worldwide in oxidized iron zones and consistent with the arid regions of Iran.
