sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (composition cannot be confirmed from the image)

AI-generated identification · may be incorrect

Tan, dull, fine-grained surface with scattered darker grains and a rounded shape; likely Mohs hardness about 6–7 if quartz-rich. Grain size and mineral composition are not clear enough to identify precisely.

Identified October 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand grains compacted and cemented in a sedimentary environment, then rounded by transport in water or abrasion. Its age and original formation environment cannot be determined from the photograph.

Uses & applications

Small pebbles are used for landscaping, craft, and collecting; sandstone is also used as building stone and aggregate.

Geological facts

Sandstone can vary greatly in composition and cement, so appearance alone cannot establish its exact variety.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; a fresh broken surface may reveal cement and grain boundaries. Rounded sandstone pebbles occur in river, beach, and glacial deposits worldwide.