gemstone

Polished jasper pebble

Microcrystalline quartz (SiO₂), likely brecciated or orbicular jasper with iron-oxide impurities

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, black, orange, and cream coloration with a smooth polished surface and vitreous-to-waxy luster. Massive, cryptocrystalline structure with no visible cleavage; specific gravity roughly 2.5–2.7.

Identified September 14, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic ash, breccia, or other rocks, while iron oxides create the red-brown colors. Jasper deposits commonly formed in volcanic and hydrothermal environments from Precambrian to younger ages.

Uses & applications

Used as a lapidary stone for cabochons, polished stones, carvings, beads, and ornamental objects; not generally used as a structural material.

Geological facts

The mottled pattern likely reflects brecciation, mineral replacement, or iron-rich inclusions rather than distinct large crystals. Polishing accentuates jasper’s contrasting colors and patterns.

Field identification & locations

Identify by its opaque appearance, very fine grain, hardness, conchoidal fracture, and inability to scratch it with a steel knife easily; it may scratch glass. Common sources include India, Madagascar, Brazil, Australia, and the western United States.