sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or altered volcanic ash, often associated with hydrothermal activity and ancient ocean basins. Geological age varies widely from Precambrian to Cenozoic.
Uses & applications
Used in ornamental stone carving, cabochons, polished decorative objects, jewelry, and by mineral collectors.
Geological facts
Red jasper has been used since ancient times for talismans, seals, and jewelry. The red color comes from iron oxide impurities trapped within the microcrystalline quartz matrix.
Field identification & locations
Easily identified in the field by its opaque red color, waxy-to-dull luster, and characteristic conchoidal fracture. Commonly found in riverbeds, glacial tills, and areas with ancient hydrothermal deposits worldwide.
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