mineral
Green aventurine cabochon
Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite
AI-generated identification · may be incorrectTypically medium-green with subtle glitter, opaque to translucent, vitreous to pearly luster, Mohs hardness about 6.5–7, granular quartz crystal structure, and no prominent cleavage. The polished oval is a human-shaped geological specimen.
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Physical properties
Typically medium-green with subtle glitter, opaque to translucent, vitreous to pearly luster, Mohs hardness about 6.5–7, granular quartz crystal structure, and no prominent cleavage. The polished oval is a human-shaped geological specimen.
Formation & geological history
Forms when quartz-rich rock recrystallizes and incorporates chromium-bearing fuchsite or chlorite, commonly during metamorphism; specimens are generally Precambrian to Paleozoic in age depending on locality. Major sources include India, Brazil, Russia, and Tanzania.
Uses & applications
Used for cabochons, beads, carvings, and inexpensive ornamental stone; also sold as a decorative lapidary material and “prosperity” stone.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mica platelets; the image appears relatively fine-grained and may also be dyed or another green quartzite imitation.
Field identification & locations
Identify by its granular quartz texture, green body color, and mica sparkle; glass imitations are more uniform and often contain round bubbles. Check hardness and inspect under magnification for flaky fuchsite inclusions.
