mineral

Polished red jasper

Jasper, an opaque, microcrystalline variety of quartz (SiO₂)

AI-generated identification · may be incorrect

Typically hardness 6.5–7 Mohs, opaque reddish-brown with a vitreous-to-waxy polish; composed of microscopic quartz crystals, with iron oxides causing the color. The pictured polished piece has banded or mottled markings; cleavage is absent and fracture is uneven to conchoidal.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids or sediment cement fine particles, with iron compounds coloring the material; jasper deposits occur in many geological ages and settings.

Uses & applications

Commonly cut and polished for cabochons, beads, carvings, and ornaments; also collected as a decorative stone.

Geological facts

Jasper is a trade name for opaque, patterned chalcedony rather than a distinct mineral species.

Field identification & locations

Look for opacity, red-brown iron staining, and hardness sufficient to scratch glass; common sources include India, Brazil, Australia, and the western United States. The photo supports a jasper identification, but the exact variety cannot be determined from appearance alone.