sedimentary

Red Jasper

Red Jasper (SiO2 with Hematite inclusions)

Hardness: 6.5-7 (Mohs scale), Color: Opaque red to brownish-red, Luster: Vitreous to dull when unpolished/greasy, Crystal Structure: Trigonal/Microcrystalline (Cryptocrystalline quartz), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily as a sedimentary process when silica-rich waters circulate through volcanic ash or other sediments; the red color is caused by the inclusion of iron oxide (hematite). It can be found in formations dating from the Precambrian to more recent eras.

Uses & applications

Extensively used for lapidary work, decorative cabochons for jewelry, worry stones, ornemental carvings, and as a component in mosaics and architectural accents.

Geological facts

Red Jasper is known as a stone of endurance and nurturing; it has been used by ancient civilizations for amulets and seals for thousands of years. It is one of the most common yet beloved varieties of chalcedony.

Field identification & locations

Identify by its deep opaque red color, high hardness (cannot be scratched by a steel knife), and smooth conchoidal fracture. Common locations include India, Brazil, USA, and South Africa. Collectors look for uniform color or interesting banding.

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