mineral

Probable iron-rich mineral or weathered rock fragment

Indeterminate; possibly limonite/goethite-bearing material

AI-generated identification · may be incorrect

Small, irregular, rusty orange-brown specimen with dull to earthy luster; likely Mohs hardness about 4–5.5, opaque, noncrystalline or microcrystalline, with no visible cleavage; identification is limited by the blurred image.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Limonite and goethite commonly form through oxidation and weathering of iron-bearing minerals near Earth’s surface, often as coatings, nodules, or cavity fillings; formation ages vary widely.

Uses & applications

Iron oxides are minor iron ores, natural pigments, and common collector specimens; this small fragment has little commercial value.

Geological facts

Rusty yellow, orange, or brown coloration strongly suggests hydrated iron oxides, but similar colors can occur in weathered rocks and slag.

Field identification & locations

Check for a yellow-brown streak, magnetic response, and relatively high density; a magnet and streak test help distinguish iron oxides from ordinary sandstone or slag. Common worldwide in soils, oxidized ore zones, and weathered outcrops.