mineral

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque, reddish-brown with black and orange mottling, and a waxy to glassy luster when polished. It consists mainly of cryptocrystalline quartz with hematite/goethite and other iron minerals; no visible cleavage.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal debris, while iron oxides create the red-brown coloration. Its age depends on the source formation; this rounded, glossy piece is likely tumbled or polished rather than naturally weathered.

Uses & applications

Used as ornamental stone, cabochons, carvings, beads, bookends, and collectible specimens. It has modest commercial value unless the pattern or locality is particularly distinctive.

Geological facts

The dark patches may represent breccia fragments or manganese/iron-rich inclusions. Jasper is a variety of chalcedony-related microcrystalline quartz, though its opaque appearance comes from abundant impurities.

Field identification & locations

Identify it by its opaque red-brown body, irregular dark patterning, high polish, and lack of cleavage; a steel file should not easily scratch it. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.