mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure, and a yellowish-brown streak.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Formed through the secondary alteration and weathering of iron-bearing minerals in oxic environments, often in sedimentary or gossan settings.
Uses & applications
Historically used as a pigment (ochre) and historically as a minor ore of iron; widely collected as mineral specimens.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides like goethite and lepidocrocite.
Field identification & locations
Easily identified by its characteristic yellowish-brown streak; found worldwide, particularly in iron ore deposits and weathered rock outcrops.
