sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture)
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed primarily in sedimentary environments when silica-rich fluids permeate through rock layers, with the red color caused by iron oxide (hematite) impurities during the consolidation process.
Uses & applications
Used extensively in lapidary work for jewelry, cabochons, and beads. Also used in ornamental carvings and as a decorative stone in landscaping.
Geological facts
Known as the 'Stone of Endurance' in folklore, jasper has been used for millennia; it was frequently used in the ancient world for cylinder seals and amulets.
Field identification & locations
Identify by its characteristic dull to waxy luster, smooth conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in riverbeds and areas with significant iron deposits.
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