sedimentary
Red Jasper
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Hardness of 6.5-7 on Mohs scale; reddish-brown to terracotta color; waxy to dull luster; microcrystalline/trigonal crystal system; smooth, conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on Mohs scale; reddish-brown to terracotta color; waxy to dull luster; microcrystalline/trigonal crystal system; smooth, conchoidal fracture.
Formation & geological history
Formed when silica-rich fluids permeate fine-grained sediments or volcanic ash beds. Iron inclusions produce the distinctive deep red coloring.
Uses & applications
Popular as lapidary material, gemstone cabochons, tumbled decorative stones, and carved ornaments.
Geological facts
Red jasper has been used since ancient times for amulets, seals, and signet rings. Ancient Egyptians associated it with the blood of Isis.
Field identification & locations
Identified by its distinctive opaque red coloration, smoothness, high hardness, and fine grain. Commonly found along riverbeds and beaches worldwide.
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