sedimentary

Rounded beach or river pebble

Unidentified fine-grained rock; composition cannot be determined from the image

AI-generated identification · may be incorrect

Gray-beige, matte, fine-grained and water-worn, with no visible crystals or layering. Hardness, mineral composition, and specific gravity cannot be reliably identified visually.

Identified October 15, 2026More sedimentary →

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Physical properties

Gray-beige, matte, fine-grained and water-worn, with no visible crystals or layering. Hardness, mineral composition, and specific gravity cannot be reliably identified visually.

Formation & geological history

Likely a fragment of common bedrock rounded by abrasion during transport in water; its geological age and original rock type are unknown.

Uses & applications

Usually valued as a natural collectible or decorative pebble; no specific industrial use can be established from the image.

Geological facts

Its smooth, elongated shape is consistent with repeated abrasion, though similar shapes can form in other settings.

Field identification & locations

Field identification requires tests such as hardness, streak, and acid reaction, plus examination of a fresh surface. Rounded pebbles occur on beaches, riverbeds, and gravel deposits.