mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectMohs hardness of 4 to 5.5, yellowish-brown to dark brown color, earthy luster, amorphous crystal structure, and a yellowish-brown streak.
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Physical properties
Mohs hardness of 4 to 5.5, yellowish-brown to dark brown color, earthy luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Formed through the weathering and oxidation of iron-bearing minerals, commonly found in sedimentary environments and gossans.
Uses & applications
Used historically as a pigment for yellow ochre and as a minor ore of iron.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance; found worldwide.
