mineral
Red Jasper
Silicon Dioxide (SiO2) with Ferric Oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Dark reddish-brown; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Trigonal); Fracture: Conchoidal; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Dark reddish-brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark reddish-brown; Luster: Vitreous to dull; Crystal Structure: Hexagonal (Trigonal); Fracture: Conchoidal; Specific Gravity: 2.58–2.91
Formation & geological history
Formed via the accumulation of silica from volcanic activity or hydro-thermal circulation. The red color comes from iron oxide (hematite) impurities included during the crystallization process.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a 'healing stone' in metaphysical practices. Historically used for making tools and seals.
Geological facts
Ancient Egyptians associated red jasper with the blood of Isis and used it in amulets. It is an opaque variety of chalcedony that never allows light to pass through, even at the edges.
Field identification & locations
Identify by its reddish hue, opacity, and high hardness—it will easily scratch glass but cannot be scratched by a steel knife. Frequently found in riverbeds or as nodules in volcanic rock.
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