mineral

Tumbled brown jasper

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, opaque brown to reddish-brown, with a resinous to vitreous polish; lacks visible cleavage and has a cryptocrystalline quartz structure. The rounded shape and glossy surface indicate tumbling or polishing.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace volcanic and sedimentary material, with iron oxides producing the dark coloration. Jasper deposits occur in many geologic ages, commonly in volcanic terrains and hydrothermal settings.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; common polished pieces have modest collector value.

Geological facts

Jasper is a variety of opaque chalcedony rather than a single mineral species. Brown varieties may be marketed as picture jasper, ocean jasper, or mookaite, but the photograph alone cannot establish a precise trade name.

Field identification & locations

Identify it by its opaque body, fine texture, lack of cleavage, and resistance to scratching; it should scratch glass but not be scratched by a steel blade. Common sources include India, Madagascar, Brazil, Australia, and the western United States.