sedimentary

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, tan to reddish-brown, dull to earthy luster, and visibly granular or gritty texture. The specimen appears porous, poorly cemented, and locally stained orange-brown by iron oxides; exact mineral identification requires testing.

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains accumulated, compacted, and cemented—often by silica, calcite, or iron oxides—then exposed to weathering. Its precise geological age and depositional setting cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; iron-rich varieties are mainly collected or used locally. This rough specimen has little commercial value unless it proves to contain fossils, unusual minerals, or attractive texture.

Geological facts

The irregular cavities and contrasting patches may represent weathered cement, clasts, or possible fossil material, but no diagnostic fossil is clearly visible. A fresh surface and hand-lens examination would improve identification.

Field identification & locations

Look for individual sand grains, bedding, gritty feel, and a lack of strong cleavage; quartz-rich sandstone usually scratches glass, while calcite cement fizzes with dilute hydrochloric acid. Common worldwide in sedimentary basins and exposed cliffs or streambeds.