sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque, cryptocrystalline crystal structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed in silica-rich sedimentary environments or hydrothermal solutions, where silica precipitates and replaces other minerals in rock formations over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and polished display specimens.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, highly valued by ancient civilizations including the Greeks, Romans, and Egyptians.
Field identification & locations
Can be identified in the field by its distinct green color, high hardness that scratches glass, and waxy to dull luster with smooth conchoidal breakage.
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