mineral
Limonite after Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or microcrystalline structure, poor cleavage.
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Physical properties
Hardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or microcrystalline structure, poor cleavage.
Formation & geological history
Formed through the pseudomorphic replacement of precursor iron sulfide minerals like pyrite or marcasite during weathering and oxidation processes.
Uses & applications
Used historically as a pigment (ochre) and as a minor ore of iron, highly sought after by mineral collectors for pseudomorph specimens.
Geological facts
Limonite is not a single distinct mineral species, but rather a mixture of related hydrated iron oxides, most commonly goethite.
Field identification & locations
Easily identified by its characteristic yellowish-brown streak and earthy appearance, commonly found in oxidized iron ore deposits worldwide.
