mineral

Iron-oxide-bearing rock fragment

Likely limonite/goethite with quartz or host-rock inclusions; exact identification requires testing

AI-generated identification · may be incorrect

Small, irregular, rusty orange-brown specimen with earthy to slightly metallic luster. Likely Mohs hardness about 4–6; no visible crystal structure or cleavage; specific gravity approximately 3–4 depending on composition.

Identified August 20, 2026More mineral →

Explore Iron-oxide-bearing rock fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Probably formed by weathering and oxidation of iron-bearing minerals, producing hydrated iron oxides such as limonite and goethite. Such material commonly develops in soil, weathered rock, and hydrothermal or lateritic environments over geologically recent to ancient times.

Uses & applications

Common iron oxides are mined as iron ore and used as pigments; this tiny fragment has little practical or gem value unless it proves to be a rarer mineral or meteorite.

Geological facts

The golden-rust color is characteristic of oxidized iron. A magnet test, streak test, hardness test, and density measurement would help distinguish iron oxide from gold-bearing rock or slag.

Field identification & locations

Common in weathered outcrops, mine dumps, and stream gravels worldwide. It leaves a yellow-brown to reddish-brown streak and may be weakly magnetic if magnetite or metallic iron is present.