sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brown-red; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep brown-red
Luster: Vitreous to waxy (when polished)

Identified July 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica (quartz or chalcedony) in hydrothermal veins or sedimentary environments, where iron oxide (hematite) provides the red pigmentation. It is often found associated with ancient volcanic and sedimentary sequences worldwide.

Uses & applications

Widely used in jewelry (beads, cabochons), ornamental carvings, tumbled stones for collectors, and historically as a decorative material in seal stones and amulets.

Geological facts

Red Jasper was known as the 'rain bringer' in some Native American cultures and was frequently used by ancient Egyptians for protective amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identified by its deep red color, opacity, and smooth, waxy feel when polished. It cannot be scratched by a steel knife. Common locations include Brazil, South Africa, Australia, and the United States (western states).