mineral

Polished jasper pebble

Microcrystalline quartz (SiO₂), commonly iron-stained jasper/chert

AI-generated identification · may be incorrect

Opaque, orange-red and cream mottling with a glassy-to-waxy polish; quartz hardness is about 6.5–7 Mohs, no visible cleavage, and specific gravity is approximately 2.6. The cream area may include altered volcanic or carbonate material, so exact identification from the image is uncertain.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements volcanic ash, sediments, or other rock, with iron oxides producing red-orange colors. These pebbles commonly derive from ancient volcanic or sedimentary terrains and are later rounded by rivers or beaches.

Uses & applications

Used for cabochons, carvings, beads, polished stones, and decorative objects; attractive patterned pieces have modest lapidary value.

Geological facts

Red coloration generally comes from hematite or limonite inclusions. The specimen appears tumbled or polished rather than naturally weathered.

Field identification & locations

Identify jasper by its opacity, hardness, lack of cleavage, fine-grained texture, and resistance to scratching by steel; it should not show the glassy translucence typical of agate. Common sources include Oregon, California, Arizona, Australia, India, and Madagascar.