sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Opaque brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Trigonal, microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque brick red to brownish-red
Luster: Vitreous to waxy

Identified March 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments. The red color is derived from iron (hematite) inclusions that permeate the silicate during formation.

Uses & applications

Commonly used in lapidary for jewelry (cabochons, beads), decorative carvings, meditation stones, and historically for seal stones and amulets.

Geological facts

Known as the "Stone of Endurance" in ancient lore. It was historically used in the breastplates of high priests and has been found in archaeological sites dating back thousands of years in Egypt and Mesopotamia.

Field identification & locations

Identify in the field by its deep red color, opacity (light will not pass through typical edges), and extreme hardness—it will scratch glass but cannot be scratched by a steel knife. Common in diverse locations including India, Brazil, USA (Oregon, California), and South Africa.