mineral

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

AI-generated identification · may be incorrect

Typically opaque brick-red to burgundy, with a vitreous-to-waxy luster and no visible crystals; Mohs hardness 6.5–7, conchoidal fracture, and specific gravity about 2.5–2.9. The smooth, rounded surface indicates mechanical tumbling and polishing.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediment, volcanic material, or breccia, incorporating hematite or other iron oxides; deposits are commonly Precambrian to younger. It occurs in hydrothermal veins, altered volcanic rocks, and sedimentary iron-rich beds.

Uses & applications

Used for beads, cabochons, carvings, decorative stone, and inexpensive polished specimens; occasionally used as an ornamental aggregate.

Geological facts

Its red color is caused by finely disseminated iron oxides rather than metallic copper. Some jasper varieties show brecciation, bands, orbicular patterns, or picture-like markings.

Field identification & locations

Identify it by its opaque red color, dense feel, glassy polish, and inability to scratch it with a steel knife easily; unlike red glass, it usually feels less uniformly translucent and may show natural mottling. Common sources include India, Brazil, Madagascar, Australia, and the western United States.