sedimentary

Red Jasper

Silicon Dioxide (SiO2)

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); Fracture: Conchoidal; Specific Gravity: 2.58-2.91

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

Identified June 12, 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); Fracture: Conchoidal; Specific Gravity: 2.58-2.91

Formation & geological history

Formed during the deposition of silica-rich sediments in volcanic or aqueous environments, where iron inclusions provide the red pigmentation. It often forms through the silicification of other materials.

Uses & applications

Commonly used in jewelry as cabochons or beads, ornamental decoration, lapidary arts, and spiritual/metaphysical collections. Historically used for seals and toolmaking.

Geological facts

The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It was a favorite gemstone in the ancient world, mentioned in the Bible and highly valued by the Egyptians and Babylonians.

Field identification & locations

Identify in the field by its opaque brick-red color, smooth conchoidal fracture, and extreme hardness (it will scratch glass). Commonly found in river beds, beaches, and desert plains globally.