sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, various earth-tone colors (brown, red, yellow, green), waxy to dull luster, cryptocrystalline structure with conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, various earth-tone colors (brown, red, yellow, green), waxy to dull luster, cryptocrystalline structure with conchoidal fracture.
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Used primarily for ornamental objects, cabochons, carvings, jewelry, and by collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its durability and sharp conchoidal fracture.
Field identification & locations
Identify by its opacity, hardness scratching glass, and waxy luster; commonly found worldwide in association with iron formations and volcanic rocks.
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