mineral
Limonite Geode
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness varies from 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown or black with a yellowish-brown streak.
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Physical properties
Hardness varies from 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown or black with a yellowish-brown streak.
Formation & geological history
Formed through the secondary alteration and weathering of iron-bearing sulfide minerals and rocks over geological time scales.
Uses & applications
Used historically as a pigment (ochre) and as a minor ore of iron, but primarily valued by mineral collectors.
Geological facts
Limonite is not a true distinct mineral species, but rather a natural mixture of related hydrated iron oxide minerals like goethite and lepidocrocite.
Field identification & locations
Identified easily by its distinctive yellowish-brown streak and earthy luster; commonly found in iron-rich weathering zones worldwide.
