mineral
Limonite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O)
AI-generated identification · may be incorrectHardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a brownish-black streak and submetallic to earthy luster.
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Physical properties
Hardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a brownish-black streak and submetallic to earthy luster.
Formation & geological history
Forms as an alteration product of other iron-rich minerals in weathered and oxidized zones of iron ore deposits.
Uses & applications
Historically used as a low-grade iron ore and as a natural earth pigment for yellow ochre paint.
Geological facts
Limonite is rarely crystalline and typically occurs in concretionary, mammillary, or earthy masses, often known as bog iron.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance. Found worldwide, particularly in weathered iron deposits.
