sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically earthy to vitreous luster, opaque transparency, and conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically earthy to vitreous luster, opaque transparency, and conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary basins or volcanic environments, often during the Precambrian and Paleozoic eras.
Uses & applications
Used for ornamental carvings, cabochons, jewelry, and lapidary art.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.
Field identification & locations
Found worldwide in association with iron formations, river gravels, and ancient volcanic deposits. Easily identified by its opacity, hardness, and wide variety of earthy colors.
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