sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: Deep red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 17, 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), Color: Deep red to brownish-red, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Formation & geological history

Formed via the deposition of silica from hydrothermal solutions or volcanic ash, occurring in sedimentary environments where iron oxides permeate the quartz matrix during crystallization.

Uses & applications

Primarily used as a gemstone for jewelry, decorative carvings, lapidary arts, and as a popular specimen for collectors interested in metaphysical properties.

Geological facts

Iron is the element responsible for its vibrant red color. Ancient Egyptians used Red Jasper in amulets to enhance strength and protection. It is classified as an opaque variety of chalcedony.

Field identification & locations

Identify by its deep red opaque color and smooth, waxy feel when polished. It cannot be scratched by a steel knife. Commonly found in Brazil, India, USA, and South Africa.