sedimentary

Rounded beach pebble

Lithology indeterminate; likely fine-grained sandstone, mudstone, or weathered volcanic rock

AI-generated identification · may be incorrect

Smooth, water-worn, brown-gray pebble with dull to faintly earthy luster and no visible crystals or cleavage. Apparent hardness is roughly 4–7 Mohs, but composition cannot be determined reliably from the image.

Identified August 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from an older rock and rounded by prolonged abrasion in waves or flowing water; its geological age depends on the source rock and cannot be established visually. The sandy setting indicates shoreline or fluvial transport.

Uses & applications

Primarily a natural decorative or collecting specimen; similar pebbles may be used in landscaping, crafts, and polished-stone displays. It has little commercial value unless laboratory identification reveals an unusual rock type.

Geological facts

The strongly rounded shape and smooth surface are classic evidence of mechanical weathering and transport. A streak, acid, hardness, density, and fresh-break test would help identify it.

Field identification & locations

Common in beaches, riverbeds, and glacial deposits worldwide. Typically worth $0–$5; polished or unusually colored specimens may sell for about $5–$20.