sedimentary

Rounded river pebble, probably quartz-rich sandstone

Indeterminate lithic clast; likely fine-grained quartz–feldspar sandstone or weathered quartzite

AI-generated identification · may be incorrect

Light tan, fine-grained, dull to slightly earthy luster, rounded and water-worn with small pits and subtle reddish iron staining. Hardness is approximately 5–7 Mohs depending on cement and quartz content; cleavage is absent and specific gravity likely about 2.5–2.7.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from compacted sand later cemented by silica, iron oxides, or carbonate, then rounded by stream or shoreline abrasion; its precise geological age and source cannot be determined from the image.

Uses & applications

Common pebbles have little commercial value and are used decoratively, in landscaping, crafts, and aquarium displays; unsuitable for gemstone use unless unusual texture or provenance is established.

Geological facts

The smooth shape indicates prolonged transport or abrasion rather than crystal growth. A steel knife, glass-scratch, acid, and streak tests would help distinguish sandstone, quartzite, and limestone.

Field identification & locations

Common in streambeds, beaches, gravel deposits, and glacial sediments worldwide. Estimated value: $0–$5 as an ordinary pebble, or roughly $5–$20 if selected for attractive texture or locality.