sedimentary
Red Jasper
Opaque Microcrystalline Quartz (SiO2 with Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull to greasy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from hydrothermal solutions or volcanic ash, with the red color derived from high concentrations of iron oxide (hematite) inclusions during the sedimentation process.
Uses & applications
Used extensively in jewelry as beads and cabochons, for ornamental carvings, as a gemstone for collectors, and historically as personal seals or talismans.
Geological facts
Red Jasper is known as a stone of endurance and was called the blood of Mother Earth in some ancient cultures. It is often found in large massive forms rather than distinct crystals.
Field identification & locations
Identified by its deep red color, opacity, and smooth conchoidal fracture. Often found in gravel beds or near volcanic regions. Collectors look for pieces with interesting patterns or high iron content.
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