sedimentary

Rounded brown river pebble

Likely iron-stained quartz-rich sandstone or fine-grained volcanic rock; precise identification requires testing

AI-generated identification · may be incorrect

Dull, brown, fine-grained surface with rounded edges from abrasion; mineral hardness and specific gravity cannot be determined visually. No obvious crystals or cleavage are visible.

Identified October 8, 2026More sedimentary →

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Physical properties

Dull, brown, fine-grained surface with rounded edges from abrasion; mineral hardness and specific gravity cannot be determined visually. No obvious crystals or cleavage are visible.

Formation & geological history

Likely shaped by prolonged water or sediment abrasion; brown coloration may result from iron-oxide staining. Its geological age and original formation environment cannot be established from the photograph.

Uses & applications

Primarily a natural-history or decorative collectible; similar material may be used as aggregate or landscaping stone.

Geological facts

The smooth, rounded shape indicates transport and abrasion, commonly in streams or along shorelines.

Field identification & locations

Look for grain texture, hardness, and streak: quartz-rich sandstone may feel gritty, while a volcanic pebble may be dense and fine-grained. Commonly found in riverbeds, beaches, and glacial deposits.