metamorphic
Green aventurine (likely rough/tumbled quartzite)
Quartzite dominated by quartz (SiO₂), colored by fuchsite mica or chlorite
AI-generated identification · may be incorrectTypically pale to medium green, translucent to opaque, with a vitreous-to-waxy luster and granular texture; quartz hardness is about Mohs 7, with no prominent cleavage and specific gravity near 2.65. The pictured pieces may also be green quartz or serpentine, which cannot be confirmed visually alone.
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Physical properties
Typically pale to medium green, translucent to opaque, with a vitreous-to-waxy luster and granular texture; quartz hardness is about Mohs 7, with no prominent cleavage and specific gravity near 2.65. The pictured pieces may also be green quartz or serpentine, which cannot be confirmed visually alone.
Formation & geological history
Quartz-rich sandstone recrystallized during metamorphism, commonly with chromium-bearing mica or chlorite producing the green color; formation ages vary widely by locality. Common sources include India, Brazil, Russia, and Tanzania.
Uses & applications
Used for beads, carvings, cabochons, ornamental stone, countertops, and inexpensive decorative specimens.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica inclusions; these pieces appear relatively matte and may be green quartzite or serpentine instead.
Field identification & locations
Look for a granular quartz texture and scratch resistance near Mohs 7; green serpentine is softer (about 3–6) and often waxier. A streak, hardness test, and close inspection for mica flakes would improve identification.
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