sedimentary

Weathered iron-rich sandstone or lateritic rock

Quartz-rich sandstone with iron-oxide cement; possibly ferruginous laterite

AI-generated identification · may be incorrect

Tan-brown, rough, granular, and crumbly-looking with rusty iron staining and scattered darker grains. Likely hardness about 5–7 where quartz-rich; generally dull to earthy luster, with no obvious cleavage and variable porosity.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted sand cemented by silica and iron oxides, or from intense tropical weathering that concentrated iron and aluminum. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, aggregate, and occasionally decorative material; laterite may be used locally for road base or construction. This unpolished specimen has little commercial or jewelry value.

Geological facts

Iron oxides such as hematite and goethite produce the ochre, reddish-brown coloration. The darker patches may be iron-rich concretions or embedded lithic/mineral fragments.

Field identification & locations

Look for visible sand grains, gritty texture, earthy fracture, and a reddish-brown streak or staining; quartz grains may scratch glass. Confirm with a dilute acid test only if carbonate cement is suspected, plus a hand lens and streak test.