mineral

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

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

AI-generated identification · may be incorrect

Ochre-yellow to rusty brown, earthy and rough with a dull to slightly metallic luster; goethite has Mohs hardness 5–5.5 and orthorhombic crystals, though this specimen appears massive. Exact composition and hardness cannot be confirmed from the image.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation and weathering of iron-bearing minerals, commonly in soils, caves, and hydrothermal deposits; age depends on the deposit and cannot be determined visually.

Uses & applications

Iron oxides are iron ores and natural pigments; attractive specimens may be collected, but this rough piece appears to have little gem or ornamental use.

Geological facts

Goethite and related hydrated iron oxides produce many yellow, ochre, and brown earth pigments.

Field identification & locations

The earthy orange-yellow color and irregular, weathered surface suggest an iron-rich material. It cannot be reliably distinguished from other iron oxides by appearance alone; a streak and hardness test or laboratory analysis would help.