sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, usually yellow, brown, red, or green, amorphous or microcrystalline crystal structure, no cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, usually yellow, brown, red, or green, amorphous or microcrystalline crystal structure, no cleavage.
Formation & geological history
Formed from silica-rich solutions or deposits of radiolarian ooze in marine environments, often later subjected to hydrothermal alteration.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a collector 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
Found worldwide in riverbeds, sedimentary deposits, and volcanic regions. Identified by its opacity and waxy luster.
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