sedimentary

Rounded yellow-brown river pebble

Indeterminate lithology; possibly weathered sandstone or chert

AI-generated identification · may be incorrect

Fine-grained, opaque, dull to slightly waxy surface, Mohs hardness approximately 3–7 depending on composition; rounded edges and minor pits indicate abrasion. Color may reflect iron-oxide staining; no visible crystals or cleavage.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally weathered and water-worn clast formed in a river, beach, or glacial deposit. Its exact geological age and parent rock cannot be determined from the photograph.

Uses & applications

Primarily a decorative or teaching specimen; similar pebbles may be used in landscaping, crafts, and lapidary work. No reliable gemstone value is apparent.

Geological facts

The smooth, flattened form records prolonged transport and abrasion. Iron oxides commonly produce yellow, ochre, and brown coloration in otherwise pale rocks.

Field identification & locations

Identify in the field by its rounded shape, uniform fine texture, lack of visible grains, and earthy yellow-brown color; a hardness or streak test would distinguish sandstone, chert, and other possibilities. Common in stream gravels worldwide.