mineral

Polished brecciated jasper

Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide staining and breccia fragments

AI-generated identification · may be incorrect

Typically opaque, reddish-brown with cream or golden angular patches; dull to vitreous polish, no visible cleavage, Mohs hardness about 6.5–7, and specific gravity around 2.6. The pattern suggests cemented fragments in a silica-rich matrix.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or cements sedimentary or volcanic material, often with iron oxides producing red-brown colors; commonly Precambrian to younger. This specimen has been cut and polished.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, ornaments, and decorative inlay; it has little industrial value compared with ordinary quartz.

Geological facts

Jasper is technically a rock rather than a single mineral, although quartz dominates its composition. Brecciated varieties are prized for their angular mosaic patterns and are sometimes sold under regional trade names.

Field identification & locations

Identify it by its opaque body, red-brown iron coloration, angular cream inclusions, and resistance to scratching by a steel knife; glass should not scratch it easily. Common sources include India, Madagascar, Brazil, Australia, and the western United States.