sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including brown, red, yellow, and green, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including brown, red, yellow, and green, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine sediments.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a popular tumbled stone for collectors.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, frequently mentioned in ancient lapidary texts.
Field identification & locations
Found worldwide in riverbeds, ancient marine deposits, and hydrothermal veins. Identified by its hardness, opacity, and smooth waxy luster when polished.
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