sedimentary
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Hardness of 6.5 to 7 on the Mohs scale, predominantly green color with brownish matrix patches, waxy to dull luster, cryptocrystalline structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, predominantly green color with brownish matrix patches, waxy to dull luster, cryptocrystalline structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91
Formation & geological history
Forms by the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often originating from ancient marine deposits or volcanic ash beds
Uses & applications
Used primarily in lapidary arts, making cabochons, carvings, ornamental objects, and as a collector's mineral specimen
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and ability to hold a sharp edge when fractured
Field identification & locations
Can be identified in the field by its opaque green coloration, hardness that scratches glass, and smooth conchoidal fracture. Found worldwide in regions with past volcanic or hydrothermal activity
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