sedimentary
Jasper
Silicon dioxide with impurities (SiO2)
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Displays opaque red, brown, yellow, or green colors with a waxy to vitreous luster and microcrystalline quartz structure.
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Physical properties
Mohs hardness of 6.5 to 7. Displays opaque red, brown, yellow, or green colors with a waxy to vitreous luster and microcrystalline quartz structure.
Formation & geological history
Forms via the precipitation of silica-rich fluids in sedimentary basins or volcanic cavities, often during the Precambrian and Paleozoic eras.
Uses & applications
Used extensively for ornamental carvings, cabochons, jewelry, and polished collector specimens.
Geological facts
Jasper has been utilized by ancient humans since the 4th millennium BC for making tools, seals, and decorative ornaments.
Field identification & locations
Identified by its opaque appearance, conchoidal fracture, and lack of streak transparency. Commonly found globally in locations like India, Brazil, Madagascar, and the western United States.
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