sedimentary

Iron-rich lateritic rock / weathered ironstone

Ferruginous laterite, commonly hematite–goethite-rich (Fe₂O₃–FeO(OH))

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to submetallic luster, irregular fracture and weak layering; typically hardness ~4–6, with variable porosity and high specific gravity. The pale gray-brown coating may be weathered clay or silica; no diagnostic crystal faces are visible.

Identified August 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms by intense tropical weathering that removes soluble elements and concentrates iron oxides, commonly developing over basaltic or crystalline basement. Such laterites are generally young, Cenozoic weathering products rather than a single ancient rock layer.

Uses & applications

Used as iron ore when sufficiently enriched, and locally for road aggregate, building stone, and pigment. This hand specimen has little commercial value unless assays show high iron content.

Geological facts

The metallic-looking dark red-brown material is most consistent with hematite/goethite rather than a gemstone. A streak test on unglazed porcelain would help: hematite gives red-brown streak, while magnetite gives black streak and stronger magnetism.

Field identification & locations

The reported Karnataka location is highly compatible with ferruginous laterite and weathered ironstone. Test magnetism, streak, and density; a fresh broken surface and dilute acid test would further distinguish it from slag or cemented soil.