sedimentary
Red Jasper
Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep brownish red, Luster: Dull to waxy, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to deep brownish red, Luster: Dull to waxy, Crystal structure: Trigonal/Microcrystalline, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color comes from high concentrations of iron oxide (hematite) during the mineralization process over millions of years.
Uses & applications
Used primarily in lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular specimen for rock collectors and practitioners of crystal healing.
Geological facts
Jasper has been used as a gemstone since antiquity; it was known as the 'supreme nurturer' in ancient cultures and was frequently used in the seals of Mesopotamian civilizations and the breastplates of high priests.
Field identification & locations
Identify in the field by its deep red color, characteristic conchoidal fracture (curved glass-like breaks), and its inability to be scratched by a steel knife. It is frequently found as water-worn pebbles in river beds.
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