sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 on Mohs scale; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep terracotta
Luster: Vitreous to waxy

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 on Mohs scale; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed via the deposition of silica from volcanic ash or water in sedimentary environments. Its red color is derived from high concentrations of iron oxide inclusions. It can form in various geological ages ranging from the Precambrian to recent eras.

Uses & applications

Extensively used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular collected semi-precious stone. Historically used for seals and amulets.

Geological facts

Red Jasper is known as a stone of endurance and was historicaly called the 'Blood of Mother Earth.' It is a cryptocrystalline variety of quartz that gets its opaque nature from high mineral impurity levels.

Field identification & locations

Identified in the field by its opaque red color, conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, South Africa, and the southwestern United States. Collectors should look for vibrancy of color and absence of fractures.