metamorphic

Tumbled river stones (likely quartzite, jasper, and chert)

Varied silicate rocks, chiefly quartzite (SiO₂), jasper/chert (microcrystalline SiO₂)

AI-generated identification · may be incorrect

Rounded, polished stones with reddish-brown, gray, and cream colors; typically vitreous to waxy luster, no visible cleavage, and Mohs hardness about 6.5–7. Quartzite is granular, while jasper/chert is very fine-grained; specific gravity is commonly 2.5–2.7.

Identified September 7, 2026More metamorphic →

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At a glance

Common name: Tumbled river stones (likely quartzite, jasper, and chert)
Scientific name: Varied silicate rocks, chiefly quartzite (SiO₂), jasper/chert (microcrystalline SiO₂)
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 per small stone; attractive polished jasper or quartzite pieces may sell for roughly $5–$25.

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

These are likely natural stream-worn or commercially tumbled fragments, formed from silica-rich sediment or metamorphosed sandstone. Their precise geological ages and localities cannot be determined from the image.

Uses & applications

Used as decorative pebbles, craft materials, garden accents, and inexpensive cabochon or lapidary stock; attractive jasper varieties may be used in jewelry.

Geological facts

The smooth, rounded surfaces result from abrasion by water or tumbling media. Red coloration commonly comes from iron oxides, while gray or cream areas reflect quartz-rich composition or weathering.

Field identification & locations

Identify by testing hardness against glass, examining grain size, and checking for iron-red patterns; quartz-rich specimens should scratch glass. Common sources include river gravels and commercial lapidary suppliers worldwide.