sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, multicolored (often red, brown, yellow, green, or patterned), cryptocrystalline structure, conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, multicolored (often red, brown, yellow, green, or patterned), cryptocrystalline structure, conchoidal fracture.
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash or iron-rich deposits over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, lapidary art, and as a collector's mineral specimen.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with mentions dating back to antiquity across various cultures.
Field identification & locations
Found worldwide in riverbeds, ancient marine deposits, and volcanic regions. Identified by its hardness, opacity, and smooth, waxy polish when tumbled or cut.
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