mineral
Limonite Nodule
Hydrated Iron Oxide-Hydroxide (FeO(OH)·n(H2O))
AI-generated identification · may be incorrectHardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or cryptocrystalline structure, specific gravity 2.7-4.3.
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Physical properties
Hardness 4-5.5 on Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous or cryptocrystalline structure, specific gravity 2.7-4.3.
Formation & geological history
Formed through the alteration and oxidation of other iron-bearing minerals in weathering environments and sedimentary deposits.
Uses & applications
Used historically as a source of iron ore, as a yellow pigment (ochre), and collected by enthusiasts.
Geological facts
Limonite is not a single distinct mineral, but rather a mixture of related iron oxides and hydroxides. It often forms pseudomorphs after other minerals like pyrite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance; commonly found in oxidized iron ore deposits 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
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