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, earthy to submetallic luster, amorphous crystal structure, and a yellowish-brown streak.
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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, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing minerals and rocks in aqueous environments, commonly found in gossans and sedimentary iron deposits.
Uses & applications
Historically used as an iron ore and a yellow ochre pigment for paints, but primarily a collector specimen today.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides like goethite and lepidocrocite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance; found worldwide, particularly in weathered iron ore zones.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
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