sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 on the Mohs scale; Color: Brick red to brownish-red due to iron inclusions; Luster: Vitreous to dull; Crystal structure: Hexagonal (Microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91

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

Identified March 30, 2026More sedimentary →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the accumulation of silica-rich volcanic ash or fine sedimentary material, often associated with hydrothermal activity. It occurs in various geological ages ranging from the Pre-Cambrian to more recent eras.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and carvings. Historically used for ornaments, seals, and as an ornamental stone in construction and furniture inlay.

Geological facts

Jasper has been revered since ancient times; the Egyptians used red jasper to promote fertility and protection, and it is mentioned in the Bible as one of the stones in the High Priest's Breastplate.

Field identification & locations

Identify by its opaque nature (unlike translucent carnelian), its waxy feel when tumbled, and its characteristic dull luster on rough surfaces. Found globally in areas such as India, Brazil, Madagascar, and the USA (southwest).