mineral

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Typically opaque, multicolored red, yellow, brown, and cream with a glassy-to-waxy polish; hardness about 6.5–7 Mohs, cryptocrystalline structure, no visible cleavage, and specific gravity near 2.6. The pictured piece appears tumbled or polished.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace fine sediments or volcanic material, with iron oxides producing the red and yellow colors; ages vary widely, commonly Paleozoic to Cenozoic. Common in volcanic and sedimentary terrains.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive collector specimens; occasionally used as decorative stone.

Geological facts

Jasper is an opaque variety of chalcedony and quartz, unlike transparent gemstone-quality quartz. Brecciation creates angular color patches later cemented by silica.

Field identification & locations

Identify by its opaque patterned appearance, very fine texture, waxy luster, and inability to scratch with a steel knife; quartz or glass can scratch it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.