sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, microcrystalline quartz structure, concoidal fracture, specific gravity of 2.55 to 2.91
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, microcrystalline quartz structure, concoidal fracture, specific gravity of 2.55 to 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 basins.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Can be identified by its opaque nature, high hardness that scratches glass, and waxy luster when polished. Commonly found in river beds and ancient marine deposits worldwide.
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