mineral

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂)

AI-generated identification · may be incorrect

Opaque brick-red to reddish-brown, with a matte-to-waxy luster and subtle pale mottling; hardness about 6.5–7 Mohs, trigonal microcrystalline structure, no cleavage, and specific gravity around 2.5–2.7. The rounded form indicates tumbling or natural water wear.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediments, commonly incorporating iron oxides that produce the red color. Deposits occur in many ages, from Precambrian formations to younger volcanic and sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and ornamental objects; historically used for tools and small sculptures. Common tumbled pieces have modest collector value.

Geological facts

Its red color is chiefly caused by hematite or other iron oxides, while the fine texture reflects chalcedonic or microcrystalline quartz. It is often confused with red chert, which is compositionally similar.

Field identification & locations

Identify by its opaque red-brown color, uniform fine grain, glassy-to-waxy surface, and inability to scratch it with a steel knife easily. Common sources include India, Madagascar, Brazil, Australia, South Africa, and the western United States.