igneous
Jasper in Basalt
Silicon dioxide in volcanic rock (SiO2)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale, waxy luster, opaque green and reddish-brown coloration, microcrystalline quartz structure.
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Physical properties
Hardness 6.5-7 on Mohs scale, waxy luster, opaque green and reddish-brown coloration, microcrystalline quartz structure.
Formation & geological history
Formed via hydrothermal silica-rich fluids filling vesicles in cooling basaltic lava flows over millions of years.
Uses & applications
Used for lapidary arts, cabochons, ornamental carvings, and geological collecting.
Geological facts
Vesicles in basalt often trap hydrothermal solutions that crystallize into chalcedony, agate, or jasper over geological time.
Field identification & locations
Identify by its dense, smooth water-worn exterior contrasting with a vibrant microcrystalline interior pocket. Found worldwide in volcanic regions.
