sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Hardness: 6.5 - 7 on Mohs scale; Color: Terracotta to deep brick red; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58 - 2.91

Hardness: 6
Color: Terracotta to deep brick red
Luster: Dull to vitreous

Identified March 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of tiny silica particles in volcanic ash or sedimentary deposits, which are then cemented together by hydrothermal activity. Its red color comes from high concentrations of iron oxide (Hematite) incorporated during the silicification process.

Uses & applications

Predominantly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and metaphysical collecting. Historically used for seals and amulets.

Geological facts

Red Jasper has been used by humans for thousands of years; it was known as the 'bringer of courage' in ancient Egypt and was famously one of the stones set into the High Priest's Breastplate described in the Bible.

Field identification & locations

Identify in the field by its intense red opaque color, conchoidal (shell-like) fracture pattern, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, France, Germany, and the Southwestern United States.

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