mineral

Tumbled jasper (likely brecciated or leopard jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque reddish-brown, cream, and mauve coloration; typically dull to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The rounded shape indicates tumbling or natural water wear.

Identified August 15, 2026More mineral →

Explore Tumbled jasper (likely brecciated or leopard jasper) in the encyclopedia →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or brecciated rock, with iron oxides producing red-brown tones. It may form across many geological ages, commonly in volcanic and sedimentary environments.

Uses & applications

Used for cabochons, beads, carvings, polished stones, lapidary décor, and inexpensive jewelry; rarely used as a minor ornamental building stone.

Geological facts

Brecciated jasper contains angular fragments cemented by chalcedony, while leopard jasper shows orbicular or spotted patterns; the image’s pattern is not diagnostic enough for a precise variety.

Field identification & locations

Identify it by its opaque patterned body, glassy-to-waxy silica texture, lack of cleavage, and inability to scratch it with a steel knife easily. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.