sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including brownish-yellow with dark dendrites or patterns, 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, opaque luster, various colors including brownish-yellow with dark dendrites or patterns, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed by the precipitation of silica from water, often associated with hydrothermal veins or sedimentary deposits rich in silica, dating across various geological ages.
Uses & applications
Commonly used for lapidary work, making cabochons, ornamental carvings, and jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Identified by its hardness, opacity, and distinctive patterned appearance. Found globally in riverbeds, sedimentary rock formations, and ancient marine deposits.
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