mineral

Polished jasper or iron-rich chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to slightly translucent, mustard yellow, orange-brown, reddish, and gray-green, with a waxy to vitreous luster and no visible cleavage. The rounded surface indicates natural water wear or tumbling/polishing.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater filled cavities or replaced volcanic/sedimentary material, while iron oxides produced the warm colors; formation is generally younger than the host rocks and may span the Cenozoic to older geological periods. Exact identification and age require testing.

Uses & applications

Used as a low-cost ornamental stone for cabochons, beads, carvings, and polished specimens; suitable for jewelry and decorative objects. Common pieces have modest collector value.

Geological facts

The image is most consistent with jasper, but the specimen could include agate or other iron-stained chalcedony. A streak test, translucency check, and microscopic examination would distinguish these varieties.

Field identification & locations

Common in volcanic terrains, river gravels, and silica-rich sedimentary deposits worldwide, including Oregon, California, Brazil, India, Madagascar, and Australia. Estimated value: $2–$15 for a small common polished pebble; higher-grade patterned material may sell for $20–$75.