mineral

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly brecciated host rock

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to dull/submetallic luster, irregular granular texture, and no visible crystal faces; likely Mohs hardness about 4–6, with moderate-to-high specific gravity. The pale metallic-looking patches may be iron oxides or another mineral inclusion.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed by oxidation and weathering of iron-bearing minerals, commonly producing limonite/goethite and hematite; the irregular texture may reflect brecciation or replacement. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Primarily a specimen or teaching sample; iron oxides are important ores and pigments, but this small piece has no practical construction or jewelry use.

Geological facts

A reddish-brown streak on unglazed porcelain would support hematite/limonite; a yellow-brown streak and earthy appearance favor goethite or limonite. A magnet test may detect associated magnetite, though hematite and goethite are usually weakly magnetic or nonmagnetic.

Field identification & locations

Common in weathered iron deposits, soils, caves, and oxidized zones of sulfide or magnetite-bearing rocks worldwide. Test streak, hardness, magnetism, and specific gravity; definitive identification requires chemical or X-ray analysis.