sedimentary

Brown weathered river pebble

Indeterminate lithology; likely ferruginous sandstone, mudstone, or weathered volcanic rock

AI-generated identification · may be incorrect

Fine-grained, rounded, matte to dull earthy luster, brown from iron-oxide staining, with small pits and surface fractures. Hardness cannot be determined visually; likely about Mohs 3–6 depending on composition; no visible crystals or cleavage.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Rounded by abrasion in a stream, beach, or glacial deposit, with later chemical weathering and iron-oxide staining. Exact geological age and source rock are unknowable from the photograph.

Uses & applications

Primarily a landscaping, educational, or casual collecting specimen; it has no identifiable gem or industrial value without confirmed composition.

Geological facts

The smooth shape indicates prolonged transport or tumbling, while the porous surface may reflect weathered fine-grained rock rather than a metal-rich meteorite.

Field identification & locations

Test streak, hardness, and acid reaction: a white streak and inability to scratch glass suggest softer sedimentary material; a faint fizz indicates carbonate. Commonly found in river gravels, beaches, and glacial deposits.