sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, various colors including red, brown, yellow, and green due to impurities, dull to greasy luster, trigonal crystal system with a 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, various colors including red, brown, yellow, and green due to impurities, dull to greasy luster, trigonal crystal system with a cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments, often through the precipitation of silica in spaces or by replacing other minerals in sedimentary and volcanic rocks over millions of years.
Uses & applications
Commonly used for ornamental carvings, polished stones, cabochons in 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 decorative jewelry.
Field identification & locations
Identified by its opaque appearance, hardness that scratches glass, and smooth conchoidal fracture. Found worldwide in riverbeds, mountainous regions, and ancient marine deposits.
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