mineral
Limonite
FeO(OH)•nH2O
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure, no distinct cleavage, specific gravity ranges from 2.7 to 4.3.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure, no distinct cleavage, specific gravity ranges from 2.7 to 4.3.
Formation & geological history
Formed as an oxidation product of various iron-rich minerals, commonly found in gossans, bog iron deposits, and sedimentary environments.
Uses & applications
Historically used as a low-grade iron ore and as a yellow pigment (ochre) in paints and art.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxide minerals, primarily goethite, akaganeite, and lepidocrocite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak. Found worldwide, particularly in weathered iron deposits and soils.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral