mineral

Polished orbicular jasper

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, tan, cream, and greenish colors with orbicular patterns; glassy to waxy polish, cryptocrystalline structure, and no visible cleavage. Specific gravity is typically 2.5–2.7.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace volcanic ash and sediment, with iron and other inclusions producing the patterns; deposits range from Precambrian to younger volcanic environments.

Uses & applications

Used for cabochons, beads, carvings, decorative stones, and polished display pieces; generally valued as an ornamental material rather than for industrial construction.

Geological facts

Orbicular jasper is sometimes marketed as ocean jasper, leopard jasper, or picture jasper, though these trade names can overlap and are not always scientifically precise.

Field identification & locations

Identify it by its opaque appearance, strong polish, multicolored orbicular or brecciated pattern, and inability to scratch with a steel blade. Common sources include Madagascar, Mexico, Indonesia, Australia, and the western United States.