sedimentary

Mixed rounded river pebbles

Polymictic gravel; individual clasts likely include quartzite, granite, and other common rocks

AI-generated identification · may be incorrect

Mostly smooth, rounded, pebble-sized clasts with varied gray, tan, and white colors; hardness and mineral composition vary by pebble. Surfaces are generally dull to slightly glossy from abrasion.

Identified October 6, 2026More sedimentary →

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Physical properties

Mostly smooth, rounded, pebble-sized clasts with varied gray, tan, and white colors; hardness and mineral composition vary by pebble. Surfaces are generally dull to slightly glossy from abrasion.

Formation & geological history

Formed from assorted source rocks broken down and rounded by water transport in rivers or streams; ages depend on the original rocks, while rounding and deposition may be much more recent.

Uses & applications

Used for landscaping, garden paths, drainage, and decorative aggregate; selected pieces may be used in crafts or aquariums.

Geological facts

A mixed pebble bed is not one distinct rock type: each pebble can have a different composition and geological history.

Field identification & locations

Rounded shapes and diverse colors suggest water-worn gravel; individual stones can be identified by texture, visible grains, hardness, and acid reaction. Common in river deposits and sold as landscaping gravel.