sedimentary
Red Jasper
Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep terracotta
- Luster
- Vitreous to dull (waxy when polished)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Vitreous to dull (waxy when polished); Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments. Its deep red color comes from high concentrations of iron oxide (hematite) during the mineralization process.
Uses & applications
Commonly used in jewelry for cabochons and beads, ornamental sculptures, lapidary art, and as a popular 'pocket stone' for mineral collectors.
Geological facts
In ancient times, Red Jasper was known as the 'stone of endurance' and was frequently used by warriors on their breastplates for perceived protection and strength.
Field identification & locations
Identify in the field by its characteristic 'brick red' opaque color, conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, Egypt, and the Southwestern United States.
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