mineral

Tumbled brecciated jasper

Jasper (microcrystalline quartz, SiO₂), brecciated variety

AI-generated identification · may be incorrect

Opaque reddish-brown stone with cream/gray angular quartz-rich patches and a polished luster; hardness about 6.5–7 Mohs, cryptocrystalline structure, no visible cleavage, specific gravity roughly 2.6.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fragmented volcanic or sedimentary rock, with iron oxides producing the red-brown color. It is generally younger than the host formation and may occur in many geological ages.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and decorative objects; attractive small pieces commonly sell for about $2–$15, while exceptional patterned specimens may reach $20–$50.

Geological facts

Brecciation creates the angular contrasting fragments, distinguishing it from more uniformly colored jasper. The reddish coloration usually reflects hematite or other iron-oxide inclusions.

Field identification & locations

Identify it by its opaque body, red-brown iron staining, angular contrasting fragments, glassy-to-waxy polish, and inability to scratch with a steel knife readily. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.