metamorphic

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; rusty red to brown, opaque, with a dull to waxy luster and no visible crystals. It breaks with uneven to conchoidal fracture and has no cleavage; specific gravity is about 2.6.

Identified October 13, 2026More metamorphic →

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Physical properties

Mohs hardness 6.5–7; rusty red to brown, opaque, with a dull to waxy luster and no visible crystals. It breaks with uneven to conchoidal fracture and has no cleavage; specific gravity is about 2.6.

Formation & geological history

Jasper forms as silica-rich sediment or volcanic material becomes silicified, with iron oxides producing its color. It can occur in sedimentary or volcanic settings across many geological ages; the image alone cannot establish its exact origin or age.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; lesser-quality material is used as an ornamental stone.

Geological facts

Jasper is a variety of chalcedony, itself made of microscopic quartz crystals; its patterns and colors vary with impurities.

Field identification & locations

Look for opaque, fine-grained red-brown material that scratches glass and shows no obvious crystal faces. Jasper occurs worldwide, including in Australia, Brazil, India, and the western United States.