sedimentary

Tumbled polymictic stone, likely jasper-bearing conglomerate

Siliciclastic conglomerate with microcrystalline quartz (jasper/chert) and altered volcanic or feldspathic clasts

AI-generated identification · may be incorrect

Hardness about 6.5–7; mottled green, cream, tan, and reddish-brown; dull to waxy luster; rounded pebble with no visible cleavage. The contrasting patches suggest several cemented rock fragments rather than a single crystal mineral.

Identified August 22, 2026More sedimentary →

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At a glance

Common name: Tumbled polymictic stone, likely jasper-bearing conglomerate
Scientific name: Siliciclastic conglomerate with microcrystalline quartz (jasper/chert) and altered volcanic or feldspathic clasts
Category: sedimentary
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$75 if unusually patterned, polished, or provenance-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

Likely formed as gravel deposited by ancient rivers or volcanic-rich sedimentary systems, then lithified by silica or other cement; exact geological age cannot be determined from the photograph. Its smooth surface indicates human tumbling or natural stream abrasion.

Uses & applications

Used mainly as a lapidary, craft, or decorative specimen; comparable jasper and conglomerate are occasionally cut into cabochons, beads, and display stones. Common pieces generally have modest commercial value.

Geological facts

The red-brown areas may represent iron-oxide-stained jasper, while green zones may be altered volcanic material or epidote/chlorite-rich rock. A photo alone cannot establish a precise mineral identification.

Field identification & locations

Look for a coarse, fragmental texture, mixed clast colors, and a silica-rich, glassy-to-waxy polish; a steel file should not easily scratch it. Similar material occurs in many river gravels and volcanic sedimentary terrains worldwide.