mineral

Goethite-rich ironstone

Goethite, α-FeO(OH), likely with limonite and other iron oxides

AI-generated identification · may be incorrect

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.

Identified September 23, 2026More mineral →

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Physical properties

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.