sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Hardness: 6.5–7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to dull/waxy when unpolished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull/waxy when unpolished
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to dull/waxy when unpolished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica in hydrothermal veins or as nodules in volcanic rocks and sedimentary environments. The red color is caused by the presence of iron oxide (hematite) during the crystallization process. It can be found in formations ranging from the Precambrian era to the Cenozoic.
Uses & applications
Primary use is in decorative jewelry, cabochons, and beads. Historically used for seals and carvings. In industry, it can be used for grinding and as an abrasive due to its hardness.
Geological facts
Red Jasper has been known as the 'stone of endurance' since ancient times. It was frequently used by Egyptian healers and mentioned in various historical texts as a stone of protection and physical strength.
Field identification & locations
Identify in the field by its opaque red color and smooth, shell-like (conchoidal) fracture pattern. It will easily scratch glass but cannot be scratched by a steel knife. Common locations include Brazil, India, USA (Oregon/Idaho), and South Africa.
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