mineral

Tumbled red jasper (likely dyed)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides; possibly dyed

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque burgundy-red, vitreous to waxy luster, very fine-grained, with no visible cleavage and conchoidal fracture. The smooth rounded shape indicates machine tumbling and the unusually uniform color may indicate dyeing.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements volcanic or sedimentary material, commonly during the Precambrian to younger geologic periods. Red coloration typically comes from hematite or other iron oxides.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and inexpensive lapidary specimens; it has little industrial significance.

Geological facts

Jasper is technically an opaque variety of microcrystalline quartz rather than a single mineral species. A cotton swab with acetone on an inconspicuous area may reveal surface dye, though this can damage polish.

Field identification & locations

Common sources include India, Madagascar, Brazil, Australia, and the western United States. Identify it by its opacity, fine texture, red iron staining, quartz-like hardness, and inability to scratch with a steel knife.