metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by mineral inclusions).
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by mineral inclusions).
Formation & geological history
Formed through the metamorphism of sandstone into quartzite, during which inclusions of fuchsite mica are trapped within the quartz, giving it a green hue and shimmering quality.
Uses & applications
Used primarily for jewelry (beads, cabochons), ornamental carvings, figurines, and as a popular stone in the gemstone collecting and metaphysical communities.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to accidental discoveries of aventurine-like glass in the 18th century.
Field identification & locations
Identify in the field by its shimmering, mica-flecked interior (aventurescence) and quartz-like hardness. Commonly found in India, Brazil, Russia, and Tanzania. Look for it in areas with high metamorphic activity.
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