sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green, conchoidal fracture, and a specific gravity of 2.58 to 2.91.
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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, conchoidal fracture, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Formed in silica-rich environments, often through the precipitation of silica from water or replacement of organic material, occurring across various geological ages in sedimentary and hydrothermal settings.
Uses & applications
Used for ornamental objects, cabochons, carved items, and in lapidary arts and jewelry making.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, with ancient civilizations valuing it for its strength and protective properties.
Field identification & locations
Can be identified in the field by its waxy luster, opacity, hardness that scratches glass, and smooth water-worn texture in riverbeds.
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