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 dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

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

Identified June 27, 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 dull; Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine-grained silica in hydrothermal veins or as sedimentary deposits. Its red color comes from high concentrations of iron oxide (hematite) during its formation process, typically found in ancient volcanic and sedimentary environments.

Uses & applications

Used primarily in lapidary arts, jewelry (beads, cabochons), ornamental carvings, and as a decorative stone in landscaping. Historically used for seals and amulets.

Geological facts

The name comes from the Greek word 'iaspis', meaning spotted stone. It was once known as the 'mountain-man' stone because it was believed to provide protection during travels in the wild. Some cultures associated it with the blood of Mother Earth.

Field identification & locations

Identify in the field by its opaque nature (unlike agate which is translucent), its smooth conchoidal fracture (breaks like glass), and its inability to be scratched by a steel knife. Common in the USA, Brazil, India, and Australia.