sedimentary

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing ferruginous rock, possibly limonite

AI-generated identification · may be incorrect

Brown to yellow-brown, earthy to submetallic luster with irregular porous texture and dark iron-oxide grains; likely hardness about 4–6 Mohs, no obvious cleavage, and variable density. The image alone cannot confirm mineral identity or whether the specimen is naturally cemented versus a processed fragment.

Identified September 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when iron-bearing minerals weather and oxidize, producing goethite, hematite, and limonite that cement sediment or fill fractures; ages range from recent weathering to Precambrian iron formations. Common in laterites, iron-rich soils, hydrothermal veins, and oxidized ore zones.

Uses & applications

Used as iron ore when sufficiently rich, and historically as ochre pigment; attractive pieces may be collected as mineral specimens. It has little value for ordinary construction.

Geological facts

Yellow-brown coloration commonly reflects hydrated goethite/limonite, while black metallic areas may be hematite or manganese oxides. A streak test and magnet test would substantially improve identification.

Field identification & locations

Commonly found in Australia, Brazil, India, South Africa, and iron-rich weathering zones worldwide; identify by ochre-yellow to reddish-brown streak, earthy appearance, and possible weak magnetism. Acid testing and close inspection are recommended before calling it breccia.