sedimentary

Smooth river pebble (exact rock type indeterminate)

Unidentified rounded lithic clast; composition cannot be determined from the photograph

AI-generated identification · may be incorrect

Small, rounded, dark gray-brown pebble with a smooth, apparently matte surface. Hardness, mineral composition, crystal structure, and specific gravity cannot be reliably assessed visually.

Identified October 1, 2026More sedimentary →

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Physical properties

Small, rounded, dark gray-brown pebble with a smooth, apparently matte surface. Hardness, mineral composition, crystal structure, and specific gravity cannot be reliably assessed visually.

Formation & geological history

Likely a natural rock fragment rounded by river or beach transport; its source rock and geological age are unknown.

Uses & applications

Commonly used in landscaping, crafts, and collections; no specific industrial or jewelry use can be inferred.

Geological facts

Pebble shape and smoothness commonly result from abrasion during transport, though deliberate tumbling can produce a similar appearance.

Field identification & locations

A close-up showing fresh surfaces, grain, or a streak test would help identify its composition. Rounded pebbles occur in riverbeds, beaches, and glacial deposits.