sedimentary

Rounded pebble, likely quartz-rich river stone

Indeterminate; possibly quartzite, chert, or a weathered quartz-feldspar rock

AI-generated identification · may be incorrect

Smooth, gray-beige, fine-grained surface with dull to slightly waxy luster; apparent hardness roughly 6–7 Mohs if quartz-rich. No diagnostic crystals, cleavage, or visible foliation can be resolved from the image; specific gravity is likely about 2.6–2.7.

Identified September 10, 2026More sedimentary →

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At a glance

Common name: Rounded pebble, likely quartz-rich river stone
Scientific name: Indeterminate; possibly quartzite, chert, or a weathered quartz-feldspar rock
Category: sedimentary
Identified: September 10, 2026
Method: Standard

AI Estimated Value

Usually $0–$5 as an ordinary pebble; perhaps $5–$20 if unusually attractive, locality-specific, or sold as a polished decorative 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

Likely naturally rounded by stream, beach, or glacial abrasion from an older rock source; its geological age cannot be determined visually. The smooth shape indicates prolonged transport or weathering.

Uses & applications

Suitable as a decorative pebble, paperweight, landscaping stone, or craft material; not identifiable as a gem-quality specimen from the image.

Geological facts

The elongated, water-worn form is typical of transport-polished cobbles. A streak, acid, hardness, and fresh-break test would distinguish quartzite, chert, limestone, or other possibilities.

Field identification & locations

Commonly found in riverbeds, gravel deposits, beaches, and glacial till. Test with a steel blade or glass: quartz-rich material scratches glass, while calcite-rich limestone generally does not and fizzes with dilute acid.