mineral
Tumbled green aventurine (probable)
Aventurine quartz, SiO₂ with fuchsite mica inclusions
AI-generated identification · may be incorrectTypically translucent to opaque green, vitreous-to-waxy luster, granular quartz texture, no obvious cleavage, and Mohs hardness about 7; the specimen appears polished/tumbled with subtle mica sparkle. Exact identification is uncertain from an image alone and could include green quartzite or serpentine.
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Physical properties
Typically translucent to opaque green, vitreous-to-waxy luster, granular quartz texture, no obvious cleavage, and Mohs hardness about 7; the specimen appears polished/tumbled with subtle mica sparkle. Exact identification is uncertain from an image alone and could include green quartzite or serpentine.
Formation & geological history
Forms when quartz-rich material crystallizes with chromium-bearing fuchsite or other green minerals, commonly in metamorphic hydrothermal environments. Aventurine deposits are notably associated with India, Brazil, Russia, Tanzania, and China.
Uses & applications
Used for beads, cabochons, carvings, ornamental stone, and inexpensive metaphysical specimens; larger green quartzite is also used decoratively. Common tumbled pieces have modest commercial value.
Geological facts
The green color commonly comes from fuchsite mica rather than the quartz itself; aventurescence is caused by light reflecting from tiny inclusions. A definitive ID requires hardness, streak, specific-gravity, or microscopic testing.
Field identification & locations
Look for quartz-like hardness, a pale streak, granular texture, and glittering mica flashes under strong light; it should not be scratched by steel. Common tumbled specimens are usually sold as green aventurine.
