mineral

Polished jasper pebble

Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; cream, tan, orange, and brown patterned colors; opaque, waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Identified September 11, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; cream, tan, orange, and brown patterned colors; opaque, waxy to vitreous luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture.

Formation & geological history

Formed when silica-rich fluids replaced or cemented volcanic or sedimentary material, with iron oxides producing the brown-orange markings. Jasper deposits formed in many geological periods, commonly in volcanic terrains and river gravels.

Uses & applications

Used for cabochons, beads, carvings, tumbling, and decorative stone; attractive patterned pieces have modest lapidary value.

Geological facts

The specimen appears water-worn and polished or naturally smoothed, with brecciated or flow-like banding typical of jasper varieties. Exact variety cannot be confirmed from the image alone.

Field identification & locations

Identify by its opaque body, colorful internal patterns, quartz-like hardness, and lack of cleavage; it should scratch glass but not be scratched by a steel blade. Common in stream and beach gravels worldwide, including Oregon, California, Australia, and India.