sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Brick red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red
Luster: Dull to vitreous

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Brick red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Formation & geological history

Formed via the accumulation of silica in sedimentary environments or through hydrothermal fluids filling cracks in volcanic rocks. Its red color comes from high concentrations of iron oxide (hematite).

Uses & applications

Used extensively in jewelry as cabochons, beads, and carvings. Historically used for making tools due to its conchoidal fracture. Also popular in metaphysical collections.

Geological facts

Red Jasper was known as the 'rain bringer' in some ancient cultures. It is a variety of chalcedony that is opaque, unlike translucent agates.

Field identification & locations

Identify by its deep red color and smooth, shell-like (conchoidal) fracture surfaces. It cannot be scratched by a steel knife. Common in diverse locations like the USA (southwest), Brazil, and India.