sedimentary

Weathered rock pebble, possibly sandstone

Likely quartz-rich sandstone; precise identification requires closer examination

AI-generated identification · may be incorrect

Tan, rounded and irregular, with a rough, granular surface and darker mineral specks. Hardness and specific gravity cannot be reliably determined from the image; sandstone is commonly Mohs 6–7 where quartz-rich.

Identified September 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from cemented sand grains, then exposed and rounded by weathering or transport. Its age and exact formation environment cannot be established visually.

Uses & applications

No obvious commercial use at this size; suitable as a natural-history or collector specimen.

Geological facts

The visible mottling may reflect iron staining or mixed mineral grains, but the image does not resolve its composition conclusively.

Field identification & locations

A hand lens can reveal individual grains and cement; a scratch test and dilute acid test may help distinguish sandstone from other rocks. Sandstone occurs worldwide, especially in sedimentary basins and stream deposits.