sedimentary
Green Jasper / Green Quartz
Silicon dioxide (SiO2) with mineral impurities
Hardness of 6.5 to 7 on the Mohs scale, dark green color, vitreous to dull luster, cryptocrystalline quartz structure, conchoidal fracture with no true cleavage, specific gravity of 2.60 to 2.90.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, dark green color, vitreous to dull luster, cryptocrystalline quartz structure, conchoidal fracture with no true cleavage, specific gravity of 2.60 to 2.90.
Formation & geological history
Formed through the deposition of silica-rich fluids or silicious oozes in sedimentary environments, often later subjected to low-grade metamorphism or hydrothermal alteration.
Uses & applications
Used for lapidary work, cabochons, carvings, ornamental objects, and as a collector's specimen.
Geological facts
Green jasper has been used since ancient times for amulets, seals, and weaponry due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its waxy-to-vitreous luster, high hardness (scratches glass), smooth waterworn surface, and opaque dark green coloration. Commonly found in riverbeds and glacial tills.
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