mineral
Limonite Concretion
Hydrated Iron Oxide-Hydroxide (FeO(OH)·n H₂O)
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 oxidation and weathering of iron-bearing minerals in sedimentary, metamorphic, and igneous environments.
Uses & applications
Used historically as a pigment (ochre), as a minor iron ore, and collected as geological specimens.
Geological facts
Limonite is not a distinct mineral species, but rather a natural mixture of related iron oxides like goethite and lepidocrocite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance; found globally in weathered iron deposits.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous