mineral
Limonite Pseudomorph
Limonite (FeO(OH)nH2O)
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, dark brown to yellowish-brown color, earthy to submetallic luster, and amorphous crystal structure.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, dark brown to yellowish-brown color, earthy to submetallic luster, and amorphous crystal structure.
Formation & geological history
Formed through the secondary oxidation and weathering of iron-rich sulfide minerals or other iron-bearing rocks over geological time.
Uses & applications
Used primarily as an iron ore, pigment in paints (ochre), and as a collectible geological specimen.
Geological facts
Limonite frequently forms pseudomorphs, meaning it replaces earlier minerals like pyrite while retaining the original crystal shape.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy texture; commonly found in weathered iron ore deposits worldwide.
