sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, opaque green color, waxy to dull luster, trigonal crystal system (cryptocrystalline), conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque green color, waxy to dull luster, trigonal crystal system (cryptocrystalline), conchoidal fracture with no true cleavage, and a specific gravity around 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or radiolarian ooze in marine environments, often subjected to low-grade metamorphism or diagenesis over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, beads, decorative items, and as a semi-precious gemstone in jewelry.
Geological facts
Green jasper has been valued since ancient times for talismans and seals. The green color is typically imparted by iron impurities, chromium, or other mineral inclusions within the chalcedony matrix.
Field identification & locations
Can be identified by its distinctive green hue, hardness that easily scratches glass, and smooth waxy feel when tumbled or polished. Found worldwide in riverbeds, beaches, and mountainous regions where silica-bearing rocks weather.
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