sedimentary
Red Jasper (with Quartz and Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red with white/translucent quartz veins; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red with white/translucent quartz veins; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments. Its red color is derived from high hematite (iron) content. Often found in ancient sea beds.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a balancing stone in metaphysical practices.
Geological facts
Jasper has been used for millennia; it was a favorite in the ancient world for seals and amulets. The name is derived from the Greek 'iaspis', meaning 'spotted stone'.
Field identification & locations
Identify in the field by its opaque nature, red streak, hardness (it will scratch glass), and smooth, waxy feel when water-worn. Common in river beds and arid regions worldwide.
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