sedimentary

Rounded gray-green beach cobble

Unidentified lithic cobble; exact rock type cannot be determined from the image

AI-generated identification · may be incorrect

Fine-grained, dull gray-green surface with rounded edges; hardness, mineral composition, and internal structure are not reliably identifiable from appearance alone. Its smooth shape is consistent with abrasion by waves or sediment.

Identified September 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a fragment of bedrock transported and rounded in a coastal or river environment; its geological age and source are unknown.

Uses & applications

Commonly used as a landscaping or decorative stone; no specific industrial or jewelry use can be assigned without identifying its composition.

Geological facts

The attached seaweed and gritty beach setting support a coastal origin, but do not determine the rock’s original type.

Field identification & locations

A rounded cobble with a fine, uniform surface; a fresh broken surface or simple hardness and acid tests would help identify it. Beach cobbles occur along shorelines worldwide.