sedimentary

Rounded quartz-rich river pebble

Likely quartzite or quartz-rich sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Pale beige, fine-grained, rounded and water-worn, with dull to weakly waxy luster; likely Mohs hardness 6–7, no visible cleavage, and quartz-dominated composition. The surface appears naturally weathered rather than polished.

Identified September 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from silica-rich sedimentary material later cemented or metamorphosed, then rounded by transport in a stream, river, or beach. Its geological age cannot be determined from the photograph.

Uses & applications

Primarily a decorative or collected pebble; quartzite can be used as aggregate, paving stone, and dimension stone, while sandstone is used in construction. This specimen has little commercial value.

Geological facts

The rounded shape records prolonged abrasion during transport. A steel knife or glass-scratch test can help distinguish quartz-rich material from softer limestone, though testing may mark the specimen.

Field identification & locations

Common in riverbeds, beaches, gravel deposits, and glacial sediments worldwide. Check for visible sand grains or layering (sandstone), versus a fused sugary texture that scratches glass (quartzite).