sedimentary

Banded river pebble, likely weathered sandstone or mudstone

Indeterminate lithic clast; probable quartz-rich sandstone or iron-stained mudstone

AI-generated identification · may be incorrect

Gray-brown, rounded and water-worn, with thin darker bands or fractures and a dull to faintly earthy luster. Likely hardness about 4–7 Mohs depending on composition; no visible crystals or strong cleavage.

Identified August 16, 2026More sedimentary →

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At a glance

Common name: Banded river pebble, likely weathered sandstone or mudstone
Scientific name: Indeterminate lithic clast; probable quartz-rich sandstone or iron-stained mudstone
Category: sedimentary
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Usually $0–$5 as a common pebble; potentially $5–$25 if confirmed as attractive jasper or a distinctive collectible stone.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed from compacted sediment and later rounded by stream or beach transport; its precise geological age and source cannot be determined from the photograph. The bands may represent bedding, iron staining, or weathering fractures.

Uses & applications

Primarily a natural curiosity or decorative pebble; not generally valuable for industry, construction, or jewelry unless it proves to be an unusual jasper or other attractive stone.

Geological facts

The smooth shape indicates prolonged abrasion during transport. A close inspection of the bands and a fresh surface would help distinguish sedimentary bedding from cracks or mineral veins.

Field identification & locations

Common in riverbeds, beaches, and gravel deposits worldwide. Test for grain texture, streak, acid reaction, and hardness; a hand lens and fresh break are more diagnostic than surface color.