sedimentary

Likely weathered river pebble

Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert

AI-generated identification · may be incorrect

Smooth, flattened, rounded brown-gray pebble with a dull earthy luster and no visible crystals or cleavage. Apparent hardness is roughly 5–7 Mohs, but composition cannot be determined reliably from the photograph.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely shaped by abrasion in a stream or river, then weathered at the surface; its geological age is unknown. Near 17.2°N, 89.1°W, weathered sedimentary pebbles are regionally plausible, especially in alluvial deposits.

Uses & applications

Primarily a natural curiosity or craft/landscaping stone; no significant industrial or jewelry value is evident.

Geological facts

The elongated, very smooth form suggests prolonged transport or abrasion. The pink-painted wooden background affects apparent color, so the pebble may be naturally gray, brown, or tan.

Field identification & locations

Identify it more closely by testing streak, hardness, acid reaction, and grain: glass-scratching suggests quartz-rich material; a weak fizz in dilute hydrochloric acid suggests carbonate rock. A fresh broken surface and a scale reference would help distinguish sandstone, chert, and limestone.