mineral

Polished orbicular jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and other inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, cream to brown and black orbicular patterns; vitreous to waxy luster and no visible cleavage. The rounded shape and smooth surface indicate tumbling or polishing.

Identified September 4, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; opaque, cream to brown and black orbicular patterns; vitreous to waxy luster and no visible cleavage. The rounded shape and smooth surface indicate tumbling or polishing.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or existing rock, with iron and manganese producing the dark patterns; its exact geological age and locality cannot be determined from the image. Orbicular varieties commonly form in volcanic environments.

Uses & applications

Used for cabochons, beads, carvings, polished display stones, and inexpensive jewelry; occasionally used as decorative architectural stone.

Geological facts

Orbicular jasper patterns are made by concentric or radiating mineral growth and alteration, not fossils. The appearance can overlap with ocean jasper, leopard jasper, or other patterned jaspers.

Field identification & locations

Identify it by its opaque composition, glassy/waxy polish, hardness, and irregular orb-like inclusions; it will not usually fizz in dilute acid. Common sources include Madagascar, Mexico, Oregon, and Australia, though locality requires provenance or testing.