sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, predominantly green color with mottled or veined patterns, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, predominantly green color with mottled or veined patterns, vitreous to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity around 2.65.
Formation & geological history
Formed through the hydrothermal deposition of silica-rich fluids or the accumulation of silica-rich radiolarian ooze, often associated with volcanic or sedimentary environments.
Uses & applications
Used primarily in lapidary arts, making cabochons, beads, decorative carvings, and occasionally as an ornamental stone in architecture.
Geological facts
Green jasper has been utilized since ancient times for talismans, seals, and jewelry. The green coloration is typically due to trace amounts of iron, chromium, or nickel impurities within the silica matrix.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy or vitreous luster on fresh breaks, and distinct green color patterns. It is found worldwide in river gravels and ancient ocean deposits.
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