sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Deep red to reddish-brown with banding, Luster: Dull to vitreous, Crystal structure: Microcrystalline (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in cavities or as sedimentary layers, often associated with volcanic ash or hydrothermal activity. Its red color is derived from high iron content (Hematite).

Uses & applications

Widely used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a component in aggregate for construction and landscaping.

Geological facts

Red Jasper has been used since antiquity; it was known as the 'rain bringer' in some Native American cultures and was used in ancient Egypt for amulets and scarabs. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identify by its opaque red color, smoothness when polished, and inability to be scratched by a steel knife. Common in the USA (Southwest), Brazil, India, and Australia. Collectors should look for unique banding or patterns.