sedimentary

Mixed rounded beach gravel

Polymictic alluvial or beach clasts, likely including quartzite, limestone, granite, and other silicate rocks

AI-generated identification · may be incorrect

Pebble-sized, rounded, variably colored gray, white, tan, and reddish clasts; individual hardness, luster, cleavage, and density vary by rock type. Rounding and smooth surfaces indicate prolonged transport and abrasion by water.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Produced by weathering and erosion of diverse source rocks, then transported and deposited by a river, wave action, or glacial meltwater; ages range from ancient source-rock ages to recent deposition.

Uses & applications

Used for landscaping, drainage, paths, aquariums, and decorative aggregate; ordinary mixed gravel has little collector value.

Geological facts

The visible material is an aggregate rather than one identifiable specimen. Rounded pebbles generally indicate sustained abrasion during transport.

Field identification & locations

Identify individual pieces by testing hardness, acid reaction, grain size, and mineral content; quartz-rich pieces resist scratching, while limestone may fizz weakly in dilute acid. Common worldwide on beaches, riverbeds, and gravel deposits.