sedimentary

Rounded gray-brown pebble

Indeterminate; likely weathered quartz-rich sandstone or fine-grained volcanic rock

AI-generated identification · may be incorrect

Dark gray-brown, dull to slightly earthy luster, fine-grained and strongly rounded; hardness approximately 5–7 Mohs depending on composition. No visible crystals, cleavage, or diagnostic banding can be resolved from the image; specific gravity is likely about 2.5–2.8.

Identified September 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably a naturally water-worn clast from a stream, beach, or gravel deposit; its geological age cannot be determined visually. The smooth shape reflects prolonged abrasion and weathering.

Uses & applications

Commonly used as a decorative pebble, landscaping stone, craft material, or specimen; no significant jewelry or industrial value is evident.

Geological facts

The surface appears naturally weathered rather than polished, though the photograph alone cannot exclude light human smoothing. A streak, hardness test, and fresh broken surface would be needed for confident identification.

Field identification & locations

Look for grain texture, reaction to dilute hydrochloric acid, and whether it scratches glass; quartz-rich rock scratches glass, while carbonate rock fizzes. Common worldwide in river and glacial gravels.