mineral

Tumbled red jasper

Microcrystalline quartz (chalcedony), primarily SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Opaque to slightly translucent reddish-brown with cream-gray patches and a vitreous-to-waxy luster; hardness about 6.5–7 Mohs, cryptocrystalline quartz structure, no visible cleavage, specific gravity about 2.6.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids cement or replace sediments and volcanic material, with iron oxides producing the red color. Deposits occur in many ages, commonly in volcanic or sedimentary environments.

Uses & applications

Used for beads, cabochons, carvings, polished stones, and decorative objects; generally inexpensive but attractive patterned pieces may be collectible.

Geological facts

The specimen appears tumbled and polished, so its rounded shape and glossy surface are human-produced. Red jasper is a variety of chalcedony rather than a separate mineral species.

Field identification & locations

Identify it by its opaque red-brown body, irregular pale inclusions, glassy polish, and inability to scratch with a copper coin; it should scratch ordinary glass. Common sources include India, Brazil, Madagascar, Australia, and the United States.