mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or microcrystalline structure, and a yellowish-brown streak.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or microcrystalline structure, and a yellowish-brown streak.
Formation & geological history
Formed through the oxidation and weathering of iron-rich minerals and rocks in sedimentary environments, hydrothermal veins, or lateritic soils.
Uses & applications
Historically used as a low-grade iron ore and as a natural earth pigment (ochre) for paints and ceramics.
Geological facts
Limonite is not a true discrete mineral, but rather a mixture of related hydrated iron oxides like goethite and lepidocrocite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy, rusty appearance; commonly found in oxidized iron ore deposits worldwide.
