sedimentary

Iron-rich breccia or weathered limonite-bearing rock

Goethite–limonite ironstone, possibly ferruginous breccia

AI-generated identification · may be incorrect

Hardness approximately 4–5.5 Mohs; rusty brown to ochre, earthy to dull/metallic luster, irregular granular texture, and no obvious cleavage. Likely composed of goethite, limonite, hematite, and cemented rock fragments; porous cavities may reflect weathering or former sulfide minerals.

Identified September 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by oxidation and weathering of iron-bearing minerals, commonly producing hydrated iron oxides in fractures, soils, hydrothermal zones, or oxidized ore deposits. Its exact age cannot be determined from the image and depends on the host deposit.

Uses & applications

Used as iron ore when sufficiently concentrated, and occasionally collected as a natural mineral specimen or pigment source; generally little jewelry value.

Geological facts

A yellow-brown streak on unglazed porcelain and attraction to a strong magnet—if hematite or magnetite is present—can help distinguish it from ordinary sandstone. Goethite and limonite commonly form rusty coatings called gossan above sulfide ore bodies.

Field identification & locations

Common in weathered iron deposits, laterites, mine dumps, and oxidized zones worldwide; inspect for a rusty streak, high apparent density, and earthy porous surfaces. The image alone cannot establish a precise species or rock classification.