mineral
Goethite-rich ironstone
Goethite, α-FeO(OH), likely with limonite and other iron oxides
AI-generated identification · may be incorrectOchreous yellow-brown to dark brown, earthy to dull luster, and irregular massive texture; goethite hardness is about 5–5.5 Mohs, with a fine-grained orthorhombic crystal structure. The image alone does not establish composition conclusively.
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Physical properties
Ochreous yellow-brown to dark brown, earthy to dull luster, and irregular massive texture; goethite hardness is about 5–5.5 Mohs, with a fine-grained orthorhombic crystal structure. The image alone does not establish composition conclusively.
Formation & geological history
Forms through oxidation and weathering of iron-bearing minerals, or precipitation from iron-rich water; such deposits range from recent to ancient and occur in soils, veins, and sedimentary iron formations.
Uses & applications
Iron ores are used in iron and steel production; earthy goethite has also served as a natural pigment. Attractive specimens may be collected, though this example appears common-grade.
Geological facts
Goethite is a major component of many ochres and rusty weathering crusts; its brown streak can help distinguish it from some similarly colored minerals.
Field identification & locations
Look for ochreous coatings, botryoidal or earthy masses, and a yellow-brown streak; common worldwide in weathered iron deposits. A streak test and laboratory analysis are needed for reliable identification.
