sedimentary

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

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

Identified March 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water into cavities or through volcanic processes where mineral-rich water infiltrates rock pockets. The distinctive red color comes from high concentrations of iron oxide (hematite). It is found in geological settings ranging from Precambrian to recent.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative carvings, and as a landscaping stone. It is also a popular specimen for rock tumbling and collector 'healing' kits.

Geological facts

Jasper has been used as a gemstone since antiquity; it was a favorite in the ancient world, mentioned in biblical texts and used for seals in Crete. Its name is derived from the Greek 'iaspis', meaning spotted stone.

Field identification & locations

Identify in the field by its opaque nature, smooth conchoidal fractures, and inability to be scratched by a steel knife. It is commonly found in riverbeds, desert regions, and mountain ranges in India, Brazil, Egypt, and the USA (southwest states).

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