mineral

Iron-stained rock fragment

Likely limonite/goethite-stained rock; the underlying rock cannot be identified confidently from the image

AI-generated identification · may be incorrect

Rough, earthy brown and ochre surface with rusty iron-oxide staining; hardness, luster, crystal structure, and specific gravity cannot be determined visually. It appears opaque and irregularly fractured.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Iron oxides such as goethite and limonite commonly form as weathering products of iron-bearing minerals near Earth’s surface; the age and original host rock are unknown.

Uses & applications

Typical fragments have little commercial use or market value; iron oxides are used as pigments and iron ores when sufficiently concentrated.

Geological facts

“Limonite” is a broad name for mixtures of hydrated iron oxides rather than a single mineral species.

Field identification & locations

Rusty colors and earthy coatings suggest iron oxidation, but a fresh break, streak test, and hardness test would help identify it. Similar iron-stained rocks occur widely in weathered soils and outcrops.