mineral

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

AI-generated identification · may be incorrect

Opaque dark-brown, rounded and polished, with a waxy-to-dull luster; quartz hardness is about 7 Mohs, and the crystal structure is trigonal but too fine-grained to see. The photograph alone cannot confirm jasper versus another brown silica-rich stone.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, often incorporating iron oxides that create brown coloration. It occurs in deposits of many ages, commonly in volcanic and sedimentary settings.

Uses & applications

Used for lapidary carving, beads, cabochons, and decorative objects; not generally an industrial or construction material.

Geological facts

Jasper is a trade name for opaque, patterned chalcedony rather than a single precisely defined mineral species.

Field identification & locations

A smooth, opaque surface and lack of visible grains fit jasper; check for consistent hardness and a glassy edge if chipped. Brown jasper is found worldwide, including India, Brazil, Australia, and the United States.