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, 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, submetallic to earthy luster, and amorphous crystal structure.
Formation & geological history
Formed through the secondary alteration and weathering of other iron-bearing minerals in oxidizing environments.
Uses & applications
Historically used as a low-grade iron ore and as a yellow-brown pigment in paints.
Geological facts
Limonite is not a true single mineral, but rather a mixture of related hydrated iron oxide minerals like goethite and lepidocrocite.
Field identification & locations
Identified easily by its distinctive yellowish-brown streak; commonly found in gossans above sulfide ore deposits.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous