sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline structure with 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, red to reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline structure with conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in marine or terrestrial environments, often subjected to low-grade metamorphism or hydrothermal activity over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, decorative objects, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used by ancient civilizations for thousands of years to create tools, seals, and jewelry. Its red coloration comes from hematite impurities.
Field identification & locations
Identified easily by its opaque nature, conchoidal fracture, smooth waterworn texture when found in rivers or beaches, and lack of visible crystal faces without magnification. Found worldwide.
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