sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including green, brown, and red, cryptocrystalline structure, 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 green, brown, and red, cryptocrystalline structure, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used for ornamental objects, jewelry, cabochons, and lapidary art.
Geological facts
Jasper has been used since ancient times for seals, talismans, and decorative items due to its durability and polishability.
Field identification & locations
Can be identified in the field by its waxy luster, conchoidal fracture, and inability to be scratched by a steel knife.
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