sedimentary

Rounded beige river pebble, likely quartz-rich sandstone

Quartz-rich sandstone (tentative; exact identification requires testing)

AI-generated identification · may be incorrect

Tan, rounded, and dull to slightly granular, with no obvious crystals or layering. If sandstone, it is composed mainly of quartz grains cemented together; quartz has Mohs hardness 7, while the rock’s overall hardness varies.

Identified October 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely sediment deposited by water and cemented into rock, then rounded by transport and abrasion. The specimen’s age and precise source cannot be determined from the image.

Uses & applications

Primarily suitable for collecting or decoration; sandstone is widely used as building and paving stone.

Geological facts

Its smooth, rounded shape is consistent with prolonged abrasion in a stream or other energetic setting.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a scratch or close inspection can help distinguish sandstone from a quartz-rich crystalline pebble. Rounded pebbles occur in riverbeds, beaches, and glacial deposits worldwide.