mineral

Likely weathered iron-rich stone

Uncertain; possibly limonite/goethite-bearing rock

AI-generated identification · may be incorrect

Small rounded brown-black specimen with earthy to dull luster and apparent granular texture. Likely hardness about 4–6 Mohs, no visible cleavage, and moderate-to-high density; exact properties require testing.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Probably formed by oxidation and weathering of iron-bearing minerals, producing limonite and/or goethite; age depends on its parent rock and cannot be determined visually.

Uses & applications

Common pieces have little industrial or jewelry use, though iron oxides are ores and pigments; attractive specimens may be collected as curiosities.

Geological facts

Brown-yellow to dark rusty coloration commonly indicates hydrated iron oxides. A reddish-brown streak on unglazed porcelain would support an iron-oxide identification.

Field identification & locations

Field identification: test streak, magnetism, hardness, and density; limonite/goethite may leave a yellow-brown streak, while a strong magnet response suggests magnetite or iron-rich material. Common worldwide in soils, weathered outcrops, and mine zones.