sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 6.5-7 (Mohs); Color: Deep opaque red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal; Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Deep opaque red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep opaque red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Fracture: Conchoidal; Specific gravity: 2.58-2.91.
Formation & geological history
Formed primarily through the infiltration of silica-rich waters into sedimentary or volcanic rock beds. Its deep red color comes from high concentrations of iron oxide (hematite) inclusions incorporated during the solidification process.
Uses & applications
Commonly used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and as an ornamental stone in mosaics. It is also highly popular in the metaphysical and specimen collecting community.
Geological facts
Red Jasper has been used for millennia across many cultures; it was known as the 'warrior's stone' in ancient times and was often used to adorn the hilts of swords and pectorals of high priests.
Field identification & locations
Identified in the field by its intense opaque red color, smoothness, and conchoidal (curved) fracture surfaces. It cannot be scratched by a steel knife. Common locations include India, Brazil, South Africa, and the southwestern United States.
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