metamorphic
Green aventurine (likely quartzite)
Quartz-rich quartzite; predominantly SiO₂ with green mica/fuchsite or chlorite inclusions
AI-generated identification · may be incorrectHardness about 7 Mohs; pale to medium green, translucent to opaque, with a vitreous-to-waxy luster and granular quartz texture. The visible sparkly inclusions suggest aventurescence, though this small tumbled specimen may also be green jasper or serpentine.
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Physical properties
Hardness about 7 Mohs; pale to medium green, translucent to opaque, with a vitreous-to-waxy luster and granular quartz texture. The visible sparkly inclusions suggest aventurescence, though this small tumbled specimen may also be green jasper or serpentine.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized during metamorphism; green coloration comes from mica, chlorite, or other minerals. Formation ages vary widely, commonly Precambrian to Paleozoic depending on source terrain.
Uses & applications
Used as tumbled stone, cabochons, carvings, countertops, and ornamental aggregate; attractive pieces have modest lapidary and collecting value.
Geological facts
Aventurine’s characteristic glitter results from reflected light off platy mineral inclusions. Green aventurine is commonly marketed as a luck or prosperity stone, though those claims are not scientific.
Field identification & locations
Check for hardness: it should scratch ordinary glass, while softer serpentine will not. Common sources include India, Brazil, Russia, and Zimbabwe; value is typically $2-$15 for a small tumbled piece, or $20-$75 for an unusually attractive polished specimen.
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