mineral
Limonite
Hydrated iron oxide-hydroxide, FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4 to 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 to 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 as an alteration product of other iron-bearing minerals in oxidizing environments, commonly found in gossans and sedimentary iron deposits.
Uses & applications
Historically used as a low-grade iron ore and as a pigment (ochre) for paints and ceramics.
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
Easily identified in the field by its characteristic yellowish-brown streak and earthy appearance, frequently found globally in weathered iron 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
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous