sedimentary
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Opaque.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Opaque.
Formation & geological history
Formed primarily through the deposition of silica from hydrothermal solutions or in sedimentary environments where iron oxides (like hematite) are present to provide the red coloration.
Uses & applications
Extensively used in lapidary work for cabochons, beads, and carvings. Historically used for seals, talismans, and as an ornamental stone in architecture.
Geological facts
Red Jasper has been used since antiquity, appearing in Minoan Crete and ancient Egypt as a stone of protection and endurance. It is technically an impure variety of silica.
Field identification & locations
Identified by its deep red color, opacity, and ability to scratch glass. Found globally, prominent sources include India, Brazil, South Africa, and the United States (western states).
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