mineral

Tumbled jasper, likely brecciated or orbicular jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque reddish-brown, orange, black, and cream mottling; waxy to dull luster; cryptocrystalline quartz with no visible cleavage. Mohs hardness about 6.5–7; dense, typically specific gravity 2.55–2.70.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary rock, with iron oxides producing red-brown colors; commonly formed during ancient volcanic or hydrothermal activity. The rounded, glossy surface indicates human tumbling and polishing.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and decorative objects; occasionally used as a minor ornamental stone.

Geological facts

Jasper is an opaque variety of chalcedony, unlike translucent agate. Color patterns vary widely and may resemble breccia, orbicular, landscape, or picture jasper.

Field identification & locations

Identify by its opaque patterned body, glassy/waxy polish, lack of cleavage, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.