mineral

Tumbled green aventurine (probable)

Aventurine quartz, SiO₂ with fuchsite mica inclusions

AI-generated identification · may be incorrect

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.

Identified August 28, 2026More mineral →

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Physical properties

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.