sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brownish red; Luster: Vitreous to waxy; Fracture: Conchoidal; Specific gravity: 2.58-2.91; Structure: Microcrystalline quartz (chalcedony)
- Hardness
- 6
- Color
- Brick red to deep brownish red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to deep brownish red; Luster: Vitreous to waxy; Fracture: Conchoidal; Specific gravity: 2.58-2.91; Structure: Microcrystalline quartz (chalcedony)
Formation & geological history
Formed when fine microcrystalline quartz precipitated from silica-rich fluids within sedimentary or volcanic environments, absorbing iron oxides which impart the characteristic deep red hue. Commonly found as beach pebbles rounded by wave action.
Uses & applications
Used in lapidary work, gemstones, cabochons, carved ornaments, decorative gravel, and popular as polished beach pebbles and tumbling specimens.
Geological facts
Red jasper was prized in ancient times; ancient Egyptians carved it into amulets and scarabs, believing it carried protective energy and represented the blood of Isis.
Field identification & locations
Look for a smooth, opaque red pebble on gravel beaches or riverbeds that cannot be scratched by a steel pocketknife. Commonly found along the Pacific coastline, Lake Superior shores, and volcanic beach deposits worldwide.
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