sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red, brownish-red
Luster: Vitreous to dull

Identified February 8, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with iron-rich hydrothermal activity. Age varies broadly from Precambrian to Cenozoic.

Uses & applications

Used primarily in lapidary arts for jewelry (cabochons, beads), decorative objects, and as a popular specimen for rock collectors.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, it was known as the 'supreme nurturer' and was worn by shamans and kings as a protective talisman.

Field identification & locations

Identify by its waxy luster, smooth touch when weathered, and deep brick-red color. Commonly found in riverbeds or coastal areas in India, Brazil, USA, and South Africa.