mineral

Red jasper

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

AI-generated identification · may be incorrect

Typically opaque brick-red to brown, with a vitreous-to-dull luster; hardness about 6.5–7 Mohs, no cleavage, and conchoidal fracture. The rounded, glossy surface indicates a tumbled and polished specimen.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediment and volcanic material, with iron oxides producing the red color. Deposits occur in many ages, commonly associated with volcanic or hydrothermal environments.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and polished lapidary pieces; occasionally as decorative stone. Common material generally has modest value.

Geological facts

Jasper is a variety of chalcedony or microcrystalline quartz, though its opaque, fine-grained texture distinguishes it from translucent agate. Color zoning, veining, or brecciated patterns can increase desirability.

Field identification & locations

Identify by its opaque red color, very fine texture, glassy polish, and inability to scratch with a copper coin; it should scratch glass, though testing a polished piece may damage it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.