sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5–7 on Mohs scale; Color: Red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
- Hardness
- 6
- Color
- Red to brownish-red
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Red to brownish-red; Luster: Dull to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica in hydrothermal veins or as sedimentary deposits where iron oxide provides the red pigmentation. It often forms through the alteration of volcanic ash or silicification of organic matter.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as an ornamental stone in landscaping.
Geological facts
Jasper has been used as a gemstone since antiquity. In many cultures, red jasper was known as the 'stone of endurance' and was believed to provide protection to warriors and explorers.
Field identification & locations
Identify by its rich red color, waxy feel, and inability to be scratched by a steel knife. It is commonly found in river beds or areas with volcanic history such as India, Brazil, and the Southwestern United States.
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