mineral

Tumbled jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly chalcedony with iron-oxide impurities

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; reddish-brown to ochre coloration, opaque, waxy to vitreous luster, and no visible cleavage. The smooth rounded surface indicates mechanical tumbling and polishing.

Identified August 26, 2026More mineral →

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Physical properties

Hardness about 6.5–7 Mohs; reddish-brown to ochre coloration, opaque, waxy to vitreous luster, and no visible cleavage. The smooth rounded surface indicates mechanical tumbling and polishing.

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron oxides producing the brown-red colors. Deposits occur in many geologic ages, commonly in volcanic terrains.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and inexpensive lapidary specimens; occasionally used as decorative stone.

Geological facts

Jasper is technically a rock rather than a single pure mineral because it contains microcrystalline quartz plus impurities and minor accessory minerals.

Field identification & locations

Identify it by its opaque fine-grained texture, earthy red-brown color, waxy polish, and inability to scratch with a steel knife; quartz should scratch glass. Common sources include India, Madagascar, Brazil, Mexico, and the United States.