sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7.0 (Mohs), Color: Opaque brick red, Luster: Vitreous to dull, Structure: Microcrystalline (Trigonal), Cleavage: None, Fracture: Conchoidal
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs), Color: Opaque brick red, Luster: Vitreous to dull, Structure: Microcrystalline (Trigonal), Cleavage: None, Fracture: Conchoidal
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or in sedimentary environments where iron oxides provide the pigmentation. Often found in volcanic and metamorphic sequences.
Uses & applications
Used extensively in jewelry as cabochons, for ornamental carvings, in lapidary work, and historically as seal stones.
Geological facts
Red Jasper was known as a stone of endurance and physical strength in ancient cultures; it was often set in the hilts of swords to provide protection to warriors.
Field identification & locations
Identify by its deep red color, opacity, and smooth waxy feel when polished. It cannot be scratched by a steel pocketknife. Commonly found in South Africa, Brazil, and the USA.
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