sedimentary

Rounded brown pebble

Unidentified lithic pebble; composition cannot be determined from the image

AI-generated identification · may be incorrect

Smooth, water-worn, opaque brown-gray surface with faint lighter streaks; grain size and luster are unclear. Hardness, cleavage, and specific gravity cannot be reliably assessed visually.

Identified October 14, 2026More sedimentary →

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Physical properties

Smooth, water-worn, opaque brown-gray surface with faint lighter streaks; grain size and luster are unclear. Hardness, cleavage, and specific gravity cannot be reliably assessed visually.

Formation & geological history

Likely a naturally rounded rock fragment abraded during transport by water or sediment. Its rock type and geological age are indeterminable from the photograph.

Uses & applications

Primarily a beach or river-pebble collectible or decorative object; no specific industrial use can be assigned without identifying its composition.

Geological facts

A rounded shape indicates abrasion, but color alone is not enough to distinguish rocks such as quartzite, chert, or fine-grained volcanic stone.

Field identification & locations

Check a fresh, unweathered surface for grains, layering, or conchoidal fracture; a hardness test and streak test can help narrow identification. Similar pebbles occur in riverbeds and along beaches worldwide.