sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments, such as hydrothermal vents or sedimentary basins, where the iron oxide (hematite) provides the red pigmentation. It is often found in prehistoric volcanic ash beds.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons, beads), decorative ornaments, and as a popular stone for tumbling and crystal healing practices.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective qualities and was often used in Babylonian seals.
Field identification & locations
Identify by its deep red color, opacity, and ability to scratch glass while resisting being scratched by a steel pocket knife. Commonly found in riverbeds and along beaches in Oregon, California, and South Africa.
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