sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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.
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