mineral

Tumbled jasper

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

AI-generated identification · may be incorrect

Opaque reddish-orange, tan, and cream coloring with earthy mottling; typically waxy to dull luster and no visible crystal faces. Mohs hardness 6.5–7, conchoidal fracture, massive microcrystalline structure, and specific gravity about 2.6.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or fractured host rock; iron oxides produce the red-orange colors. Deposits occur in many geological ages, commonly in volcanic and sedimentary terrains.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; occasionally used as aggregate or decorative stone. This rounded specimen appears polished or naturally water-worn.

Geological facts

Its patterns and colors result mainly from hematite, goethite, clay, and other inclusions rather than separate large crystals. Jasper is a variety of chalcedony or closely related microcrystalline quartz, though the term is often used broadly.

Field identification & locations

Identify it by its opacity, earthy red coloration, very fine texture, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. Common sources include India, Brazil, Madagascar, Australia, Mexico, and the western United States.