mineral
Tumbled green aventurine (likely)
Quartz (SiO₂) with fuchsite or other green mica inclusions
AI-generated identification · may be incorrectPolished, opaque-to-translucent dark green pebble with vitreous-to-waxy luster; quartz hardness is Mohs 7, lacking cleavage, with a granular or microcrystalline structure. The image shows little sparkle, so green aventurine is more likely than jade or bloodstone, but identification is not definitive from a photo.
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Physical properties
Polished, opaque-to-translucent dark green pebble with vitreous-to-waxy luster; quartz hardness is Mohs 7, lacking cleavage, with a granular or microcrystalline structure. The image shows little sparkle, so green aventurine is more likely than jade or bloodstone, but identification is not definitive from a photo.
Formation & geological history
Forms when silica-rich fluids crystallize quartz containing dispersed green fuchsite mica, commonly in metamorphic or hydrothermal environments. Its exact geological age depends on locality; major material comes from India, Brazil, Russia, and Tanzania.
Uses & applications
Used for beads, cabochons, carvings, worry stones, and decorative objects; attractive specimens commonly sell for modest prices.
Geological facts
Aventurine’s characteristic aventurescence is caused by reflective mica or hematite inclusions, though some pieces are nearly non-sparkly. It is often confused with jade, serpentine, green jasper, and dyed glass.
Field identification & locations
Check for natural inclusions, quartz-like hardness, and a cool, dense feel; glass may show bubbles, while jade is tougher and generally more fibrous. A scratch test, loupe examination, and specific-gravity or refractive-index testing are needed for confirmation.
