metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 with K(Al,Cr)2(AlSi3O10)(OH)2)
Mohs hardness 6.5 to 7; pale apple-green to sage-green color with subtle glistening specks (aventurescence); vitreous to dull waxy luster; hexagonal/trigonal crystal system; no cleavage; specific gravity ~2.65
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Physical properties
Mohs hardness 6.5 to 7; pale apple-green to sage-green color with subtle glistening specks (aventurescence); vitreous to dull waxy luster; hexagonal/trigonal crystal system; no cleavage; specific gravity ~2.65
Formation & geological history
Formed through regional metamorphism of quartz-rich sandstone containing chromium-rich mica (fuchsite). High heat and pressure recrystallize quartz grains into a durable, interconnected structure while embedding mica flakes throughout.
Uses & applications
Popular in lapidary work, cabochon cutting, beads, ornamental carvings, polished tumbled stones, and gemstone collecting.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to Venetian aventurine glass (goldstone) which was discovered accidentally before the natural mineral was named after it.
Field identification & locations
Look for a granular quartz texture combined with light green coloration and shimmering mica flecks when turned in light. Commonly found in India, Brazil, Russia, and South Africa. Easily identified by hardness (scratches glass) and distinctive green glitter.
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