sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, trigonal crystal system, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, trigonal crystal system, conchoidal fracture.
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine basins.
Uses & applications
Used for ornamental objects, cabochons, carvings, and low-cost jewelry, as well as in lapidary collections.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, and is frequently mentioned in ancient lapidary texts.
Field identification & locations
Identified by its opacity, smooth waxy polish when tumbled, hardness that scratches glass, and lack of cleavage. Commonly found worldwide in riverbeds and ancient mineral deposits.
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