mineral

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing rock; exact identification requires testing

AI-generated identification · may be incorrect

Yellow-brown, earthy to dull luster, irregular granular texture, and apparent iron-oxide staining; typically Mohs hardness about 4–5.5, with no obvious cleavage and variable density.

Identified September 11, 2026More mineral →

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Physical properties

Yellow-brown, earthy to dull luster, irregular granular texture, and apparent iron-oxide staining; typically Mohs hardness about 4–5.5, with no obvious cleavage and variable density.

Formation & geological history

Likely formed by oxidation and weathering of an iron-bearing mineral or sulfide, producing hydrated iron oxides such as limonite and goethite. The specimen’s geological age and parent rock cannot be determined from the image.

Uses & applications

Primarily a collector or field specimen; iron oxides have historically been used as ochre pigments and minor iron ore, but this small piece has no practical construction or jewelry use.

Geological facts

The porous yellow-brown appearance is characteristic of hydrated iron oxides, often called limonite even though limonite is a mixture rather than a single mineral.

Field identification & locations

Look for a yellow-brown streak on unglazed porcelain, earthy texture, and possible attraction only if magnetite is present; avoid relying on color alone. Common in soil zones, gossans, mine dumps, and weathered rock exposures.