sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to vitreous

Identified April 4, 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: Dull to vitreous; Crystal Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of volcanic ash or fine silica-rich sediments. Often found in hydrothermal veins or as nodules in sedimentary rocks. Usually associated with aged volcanic activity or silica-charged waters in sedimentary environments.

Uses & applications

Commonly used for lapidary work, jewelry (beads, cabochons), carvings, and as a popular collector's stone. Historically used for seals and amulets.

Geological facts

The red color is caused by iron inclusions (Hematite). In ancient times, it was known as the 'rain bringer' and was highly valued by many cultures for its supposed protective properties.

Field identification & locations

Identify in the field by its deep red color, conchoidal (shell-like) fracture, and the fact that it cannot be scratched by a steel knife. Frequently found in stream beds or gravel deposits.