sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick-red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58–2.91

Hardness: 6
Color: Brick-red to brownish-red
Luster: Vitreous to dull

Identified March 30, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brick-red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the deposition of silica from volcanic ash or hydrothermal solutions into cracks and voids. Its red color originates from iron oxide (hematite) inclusions that occur during sedimentation or diagenesis.

Uses & applications

Primarily used for lapidary work, cabochons for jewelry, decorative carvings, and as a popular pocket stone for crystal collectors.

Geological facts

In antiquity, jasper was considered the 'mother of all stones' by many cultures. It is an opaque variety of chalcedony that breaks with a smooth, conchoidal fracture which prehistoric humans used to make tools.

Field identification & locations

Identify in the field by its intense red color, opacity (it will not let light through even at thin edges), and its ability to scratch glass. Commonly found in India, Brazil, Madagascar, and the Southwestern United States.