sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, deep green color often with mottled or banded patterns, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, deep green color often with mottled or banded patterns, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the hydrothermal deposition of silica-rich fluids or precipitation in marine environments, often associated with volcanic activity and ocean floor sediments over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, decorative objects, and as a popular collecting specimen.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools, highly valued by ancient civilizations including the Egyptians, Greeks, and Native Americans for its protective and healing properties.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), lack of cleavage, waxy luster, and distinctive opaque green coloration. Frequently found in riverbeds, glacial drift, and areas of ancient volcanic or sedimentary activity.
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