metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs); Color: Pale to medium green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to medium green with a shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic environments where quartz-rich sediments are subjected to high pressure and temperature, often found in schist or phyllite formations. Primarily Proterozoic to Phanerozoic age.
Uses & applications
Used widely in lapidary arts for beads, figurines, and cabochons. Frequently used in jewelry, as an ornamental stone in interior design, and as a popular 'healing stone' in metaphysical collections.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance.' The shimmering effect is caused by tiny mica or fuchsite inclusions that reflect light. It is often called the 'Stone of Opportunity' in various cultures.
Field identification & locations
Identify in the field by its distinct green color combined with a grainy quartz texture and glittering mica inclusions. Found commonly in India, Brazil, Russia, and Tanzania. For collectors, look for uniform color and strong 'sparkle'.
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