sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Mohs hardness of 6.5 to 7, earthy to waxy luster, green color with brownish and dark mottling, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
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Physical properties
Mohs hardness of 6.5 to 7, earthy to waxy luster, green color with brownish and dark mottling, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or radiolarian oozes in marine environments, followed by diagenesis and low-grade metamorphism or hydrothermal alteration, often dating from the Precambrian to Cenozoic eras.
Uses & applications
Used for making cabochons, beads, ornamental carvings, decorative objects, and as a popular specimen for mineral collectors.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components. The green variety is often associated with harmony and emotional balance.
Field identification & locations
Can be identified in the field by its waxy luster, microcrystalline texture, lack of cleavage, and hardness that scratches glass. Found worldwide, commonly in riverbeds and areas of ancient volcanic or hydrothermal activity.
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