sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

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

Identified July 1, 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: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica in hydrothermal veins or as a chemical precipitate in sedimentary rocks, often enriched with iron minerals that provide the red color. Commonly found in Precambrian or Paleozoic formations.

Uses & applications

Extensively used for lapidary work, jewelry (beads, cabochons), ornamental vases, and as a healing stone in metaphysical practices.

Geological facts

Red jasper was highly prized in the ancient world as a stone of protection and was often used in the seals of high-ranking Egyptian officials. It is an opaque variety of chalcedony.

Field identification & locations

Identified in the field by its deep red color, conchoidal fracture, and extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and desert environments in regions like India, Brazil, and the Southwestern USA.