sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, green coloration often due to iron impurities, waxy to vitreous luster, cryptocrystalline structure with no visible crystal faces, conchoidal fracture, and a specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, green coloration often due to iron impurities, waxy to vitreous luster, cryptocrystalline structure with no visible crystal faces, conchoidal fracture, and a specific gravity of 2.60 to 2.65.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing existing carbonate rocks, over millions of years.
Uses & applications
Used primarily for ornamental carvings, cabochons in jewelry, polished decorative stones, and by lapidary collectors.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and intricate ornamental weapons and tools.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), lack of cleavage, smooth conchoidal fracture, and opaque green coloration. Commonly found in riverbeds, coastal beaches, and areas with ancient hydrothermal activity.
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