sedimentary

Rounded quartz-rich pebble

Likely quartz arenite or quartzite pebble; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Cream to pale gray, smooth water-worn surface with sparse reddish-brown iron-oxide spots; likely granular and dull to subtly silky. Estimated Mohs hardness 6–7, with no obvious cleavage; specific gravity approximately 2.6–2.7.

Identified August 22, 2026More sedimentary →

Explore Rounded quartz-rich pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Probably formed from quartz-rich sand cemented into sandstone or metamorphosed into quartzite, then rounded by stream or shoreline abrasion. Its precise geological age cannot be determined visually.

Uses & applications

Primarily a natural decorative or collecting specimen; similar quartz-rich stone is used as aggregate, paving, landscaping material, and occasionally dimension stone.

Geological facts

The rounded shape indicates prolonged transport or wave action, while iron staining commonly develops from oxidation of minor iron-bearing minerals or groundwater exposure.

Field identification & locations

Test suspected quartz-rich material with a steel knife or glass: it should resist scratching glass, though surface weathering may confuse the result. Common in river gravels, beaches, glacial deposits, and eroded sandstone or quartzite terrains.