sedimentary

Iron-rich sandstone or lateritic rock

Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness typically 5–7 Mohs; reddish-brown, dull to earthy luster, fine-grained and porous, with no visible cleavage. The rounded shape suggests natural abrasion or human tumbling; dark flecks may be magnetite or manganese oxides.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when sand is cemented and strongly stained by hematite/goethite in an oxidizing environment; laterite can form through intense tropical weathering. Exact geological age cannot be determined from the photograph.

Uses & applications

Commonly used locally as building or paving stone and occasionally as an ornamental specimen; generally has little jewelry value unless unusually dense, patterned, or magnetic.

Geological facts

Its red color is produced mainly by iron oxides, especially hematite. A polished or naturally water-worn surface can make the material resemble jasper, but the visible porous texture favors ferruginous sandstone or laterite.

Field identification & locations

Look for gritty grains, earthy red-brown color, porosity, and possible weak magnetism; a streak test, hardness test, and acid test would help distinguish sandstone from jasper or slag. Common in oxidized continental sediments and tropical weathering zones.