sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
Hardness 6.5-7 on Mohs scale, opaque brick-red to terracotta color, vitreous to dull luster, microcrystalline/trigonal structure, conchoidal fracture, specific gravity 2.58-2.91.
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Physical properties
Hardness 6.5-7 on Mohs scale, opaque brick-red to terracotta color, vitreous to dull luster, microcrystalline/trigonal structure, conchoidal fracture, specific gravity 2.58-2.91.
Formation & geological history
Formed when fine microcrystalline quartz precipitates from silica-rich hydrothermal fluids or volcanic ash deposits with high concentration of hematite (iron oxide).
Uses & applications
Used primarily in lapidary arts, jewelry making, cabochons, carvings, decorative beads, and ornamental stone objects.
Geological facts
Red jasper was highly prized in the ancient world for seals and talismans, believed by many ancient cultures to offer protection and endurance.
Field identification & locations
Identify by its rich opaque reddish-brown color, high polish, and hardness (scratches glass). Commonly found in South Africa, India, Brazil, Australia, and Russia.
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