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, 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, trigonal crystal system, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms from silica-rich solutions in sedimentary environments, often involving the replacement of organic material or deposition in hydrothermal veins.
Uses & applications
Used in ornamental objects, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. Its name means 'spotted or speckled stone'.
Field identification & locations
Found worldwide in riverbeds, ancient marine deposits, and volcanic regions. Identified by its hardness, opacity, and smooth polished texture when water-worn.
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