sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep brownish-red; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep brownish-red; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds. Its deep red color comes from iron impurities. It is common in Precambrian to Mesozoic formations.
Uses & applications
Used primarily in jewelry as cabochons, decorative carvings, lapidary arts, and as a 'healing stone' in metaphysical communities.
Geological facts
Ancient Egyptians often wore jasper amulets as protective charms. It is known as a microcrystalline variety of quartz and is often found in large, massive beds.
Field identification & locations
Identify by its opaque red color, high hardness (cannot be scratched by a steel nail), and smooth, conchoidal fracture. Commonly found in South Africa, India, Brazil, and the USA.
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