sedimentary

Rounded river pebble, likely quartz-rich sandstone or quartzite

Composition and exact rock type cannot be determined from the photo; likely quartz (SiO₂) with minor feldspar and rock fragments

AI-generated identification · may be incorrect

Small, rounded gray-brown pebble with a dull to slightly grainy surface and no visible crystals or cleavage. If quartz-rich sandstone, hardness is typically around 6–7 Mohs; quartzite is about 7.

Identified September 29, 2026More sedimentary →

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At a glance

Common name: Rounded river pebble, likely quartz-rich sandstone or quartzite
Scientific name: Composition and exact rock type cannot be determined from the photo; likely quartz (SiO₂) with minor feldspar and rock fragments
Category: sedimentary
Identified: September 29, 2026
Method: Standard

AI Estimated Value

Typically under $1 individually; little commercial value unless unusually attractive or part of a curated collection.

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

Small, rounded gray-brown pebble with a dull to slightly grainy surface and no visible crystals or cleavage. If quartz-rich sandstone, hardness is typically around 6–7 Mohs; quartzite is about 7.

Formation & geological history

Likely weathered from an older rock and rounded by water or sediment transport. Its geological age and original formation environment cannot be established visually.

Uses & applications

Primarily a natural collectible or decorative pebble; similar stones may be used in landscaping and craft projects.

Geological facts

Rounding and smoothing usually result from abrasion during transport, though wave action or prolonged weathering can also smooth stones.

Field identification & locations

A close-up, fresh break, and hardness or acid tests would help distinguish quartzite from sandstone and other common pebbles. Rounded pebbles occur in riverbeds, beaches, and gravel deposits worldwide.