sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-bearing sandstone; composition mainly SiO₂ with possible feldspar and iron-oxide impurities

AI-generated identification · may be incorrect

Gray-brown, subrounded to rounded, fine-grained and dull to subtly sparkly; quartz hardness 7, no obvious cleavage, conchoidal to uneven fracture, and typical specific gravity around 2.6–2.7. The surface appears naturally weathered rather than crystalline or gem-quality.

Identified August 17, 2026More sedimentary →

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At a glance

Common name: Rounded quartz-rich pebble
Scientific name: Likely quartzite or quartz-bearing sandstone; composition mainly SiO₂ with possible feldspar and iron-oxide impurities
Category: sedimentary
Identified: August 17, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; approximately $5–$20 if unusually attractive, polished, or locality-labeled.

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 a sedimentary pebble through river or beach abrasion; if quartzite, its original sandstone was metamorphosed and recrystallized. Exact geological age and provenance cannot be determined from the photograph.

Uses & applications

Primarily a natural pebble, specimen, or decorative material; not generally suitable for jewelry unless polished and attractive. Quartz-rich varieties may be used as aggregate or dimension stone.

Geological facts

The rounded shape records prolonged transport or wave action, while the pale patches may reflect quartz-rich areas, weathering, or adhered sediment.

Field identification & locations

Look for a uniformly hard, quartz-rich texture that scratches glass and does not fizz in dilute hydrochloric acid; a hand lens can distinguish interlocking quartz grains from sand-sized grains in sandstone. Common in streambeds, beaches, and glacial deposits worldwide.