sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7.0 on Mohs scale; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 on Mohs scale; Color: Brick red to deep terracotta; Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from volcanic ash or water in sedimentary environments. Its red color is derived from high concentrations of iron oxide inclusions. It can form in various geological ages ranging from the Precambrian to recent eras.
Uses & applications
Extensively used for lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular collected semi-precious stone. Historically used for seals and amulets.
Geological facts
Red Jasper is known as a stone of endurance and was historicaly called the 'Blood of Mother Earth.' It is a cryptocrystalline variety of quartz that gets its opaque nature from high mineral impurity levels.
Field identification & locations
Identified in the field by its opaque red color, conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, South Africa, and the southwestern United States. Collectors should look for vibrancy of color and absence of fractures.
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