mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectMohs hardness 4 to 5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure, specific gravity 2.7 to 4.3.
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Physical properties
Mohs hardness 4 to 5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure, specific gravity 2.7 to 4.3.
Formation & geological history
Formed through the oxidation and weathering of iron-rich minerals, often in sedimentary environments or gossans.
Uses & applications
Historically used as an iron ore and pigment (ochre); currently collected as a mineral specimen.
Geological facts
Limonite is not a true mineral species, 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 appearance; commonly found in iron deposits worldwide.
