mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness varies from 4 to 5.5 on the Mohs scale, with a yellowish-brown to dark brown streak, earthy luster, and amorphous or microcrystalline structure.
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Physical properties
Hardness varies from 4 to 5.5 on the Mohs scale, with a yellowish-brown to dark brown streak, earthy luster, and amorphous or microcrystalline structure.
Formation & geological history
Formed as a secondary mineral through the weathering and oxidation of other iron-rich minerals in sedimentary, metamorphic, and igneous environments.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment called ochre.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxide minerals like goethite and akagaganeite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance, commonly found in gossans and iron-rich soils worldwide.
