mineral
Red Jasper
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: Brick red to deep reddish-brown; Luster: Dull to waxy/vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep reddish-brown
- Luster
- Dull to waxy/vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep reddish-brown; Luster: Dull to waxy/vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed when fine microcrystalline quartz precipitates from silica-rich fluids within volcanic ash beds, sedimentary rocks, or hydrothermal veins, acquiring its characteristic red coloration from microscopic hematite (iron oxide) inclusions.
Uses & applications
Used primarily as an ornamental stone, for lapidary work, gemstones, cabochons, carvings, decorative objects, and highly valued by rockhounding collectors.
Geological facts
Red jasper has been used since ancient times for amulets and seals. It exhibits smooth, sharp conchoidal fractures, making it historically useful for knapping into arrowheads and stone tools.
Field identification & locations
Identify by its opaque brick-red color, microcrystalline texture, smooth curved conchoidal fractures, and hardness (cannot be scratched by a steel knife). Commonly found in river beds, gravel deposits, and ancient volcanic terrains worldwide.
