mineral

Iron-oxide-rich rock fragment (likely limonite/goethite)

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

AI-generated identification · may be incorrect

Rusty orange-brown, earthy to dull luster, with an irregular granular surface; goethite is about 5–5.5 on the Mohs scale and orthorhombic. The image does not allow reliable confirmation of composition or specific gravity.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation and weathering of iron-bearing minerals, or by precipitation in iron-rich soils and waters; such deposits occur across many geological ages.

Uses & applications

Iron oxides are important iron ores and are also used as pigments; this small fragment has little apparent commercial value.

Geological facts

Goethite commonly produces yellow-brown to reddish-brown staining and may occur with other iron oxides in weathered deposits.

Field identification & locations

The earthy rusty color and granular texture are consistent with an iron-rich specimen, but visual identification is uncertain; a streak test may produce a yellow-brown streak. Common in soils, weathered rocks, and iron-ore deposits worldwide.