mineral

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown, orange, cream, and purple patches; opaque, waxy to vitreous luster, cryptocrystalline quartz with no visible cleavage. The rounded shape indicates tumbling or polishing.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

A sedimentary variety of chert formed when silica-rich groundwater replaced or cemented sediments, with iron staining and later brecciation producing the angular color zones. Jasper deposits range from Precambrian to much younger ages.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; common material has modest decorative value.

Geological facts

Its patterns are caused by iron oxides, manganese, clay, and fractured silica rather than large crystals. “Brecciated jasper” describes the angular fragments cemented by jasper or quartz.

Field identification & locations

Identify it by its opaque fine grain, smooth waxy polish, red-orange iron-rich coloration, and inability to scratch with a steel knife; it should scratch glass. Common worldwide, including the western United States, Madagascar, Brazil, and Australia.