mineral
Limonite
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 sub-metallic 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 sub-metallic luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Forms as a secondary mineral resulting from the oxidation and weathering of iron-rich minerals, often in sedimentary environments or gossans above ore deposits.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment known as ochre.
Geological facts
Limonite is not a single mineral, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy texture, commonly found in oxidized iron deposit zones worldwide.
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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