sedimentary

Mixed beach gravel and sand

Unsorted siliciclastic sediment, chiefly quartz and rock fragments

AI-generated identification · may be incorrect

Rounded pebbles and coarse sand of varied colors, with likely quartz, feldspar, and lithic fragments; mineral hardness varies, commonly around 6–7 Mohs for quartz-rich grains. The grains are nonmetallic and mostly dull to glassy; crystal structure and cleavage vary by constituent.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Produced by weathering and erosion of multiple source rocks, then rounded and sorted to varying degrees by waves or streams; age cannot be determined from the image.

Uses & applications

Used as decorative gravel, aquarium or craft material, and—when appropriately graded and tested—in landscaping and construction aggregate.

Geological facts

The mixture includes pebble-sized clasts and sand-sized grains, a sediment-size range typical of beaches and stream deposits.

Field identification & locations

Rounded, mixed-size grains suggest transport by water; quartz grains are especially hard and scratch glass. Similar deposits occur on shorelines and river bars worldwide.