sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, multicolored with reds, browns, and yellows, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, multicolored with reds, browns, and yellows, waxy to vitreous luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich solutions in sedimentary environments or volcanic ash beds, often associated with hydrothermal activity or ancient seabeds.
Uses & applications
Used for ornamental carvings, cabochons, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and jewelry. The red and yellow colors are primarily due to iron oxide impurities.
Field identification & locations
Can be identified in the field by its smooth, water-worn appearance on beaches or riverbeds, conchoidal fracture, and inability to be scratched by steel. Found worldwide.
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