mineral
Limonite Pseudomorph
Limonite after Pyrite, FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, and amorphous crystal structure.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, and amorphous crystal structure.
Formation & geological history
Formed through the chemical weathering or oxidation of pre-existing iron sulfide minerals like pyrite over geological time.
Uses & applications
Primarily collected as a mineral specimen and historical source of iron ore.
Geological facts
These specimens often retain the original cubic or octahedral crystal shape of the pyrite they replaced, a process known as pseudomorphism.
Field identification & locations
Identified by its distinct rusty-brown streak and brownish coloration, commonly found in oxidized iron ore deposits worldwide.
