sedimentary

Rounded weathered pebble

Likely fine-grained sandstone, siltstone, or weathered volcanic rock; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Dull tan-gray color, earthy luster, fine-grained texture, and rounded shape from abrasion; likely hardness about 4–7 Mohs with no visible cleavage or crystals. Its porous, matte surface suggests a clastic sedimentary rock, though a fine volcanic rock is possible.

Identified August 20, 2026More sedimentary →

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At a glance

Common name: Rounded weathered pebble
Scientific name: Likely fine-grained sandstone, siltstone, or weathered volcanic rock; exact identification is uncertain from the image
Category: sedimentary
Identified: August 20, 2026
Method: Standard

AI Estimated Value

Generally $0–$5 as an ordinary pebble; up to about $10–$30 if unusually attractive, locality-specific, or confirmed as a notable specimen.

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

Probably formed as lithified sediment or cooled volcanic material, then rounded by stream, beach, or transport abrasion. Its precise geological age and formation environment cannot be determined visually.

Uses & applications

Common pebbles have little commercial value, but similar material is used as landscaping stone, aggregate, drainage material, and craft or educational specimens.

Geological facts

The smooth oval form is primarily a transport feature rather than a diagnostic rock type. A fresh broken surface, hand lens, streak, and acid test would greatly improve identification.

Field identification & locations

Common in riverbeds, beaches, gravel deposits, and glacial sediments. Check grain visibility, porosity, reaction to dilute hydrochloric acid, and whether it scratches glass; avoid damaging it if it is a potential fossil or artifact.