mineral
Tumbled green aventurine
Quartz (SiO₂), typically colored by fuchsite mica inclusions
AI-generated identification · may be incorrectHardness 7 Mohs; green, translucent to opaque, with a vitreous-to-waxy polish and subtle glitter from inclusions. Quartz has a trigonal crystal structure and no cleavage; this specimen is tumbled and polished.
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Physical properties
Hardness 7 Mohs; green, translucent to opaque, with a vitreous-to-waxy polish and subtle glitter from inclusions. Quartz has a trigonal crystal structure and no cleavage; this specimen is tumbled and polished.
Formation & geological history
A variety of quartz formed as silica-rich fluids crystallized, often in metamorphic or hydrothermal settings. Its geological age varies with the host deposit.
Uses & applications
Used for inexpensive jewelry, carvings, ornaments, and lapidary collections.
Geological facts
Aventurine’s characteristic sparkle, called aventurescence, comes from reflective mineral inclusions; green specimens commonly contain fuchsite mica.
Field identification & locations
The rounded shape and polished surface indicate a tumbled specimen; hardness and occasional glitter help distinguish it from softer green stones. Aventurine occurs in places including India, Brazil, and Russia.
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