metamorphic
Green Aventurine
Aventurine Quartz (SiO2)
Hardness: 7 Mohs; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is characterized by platy inclusions of Fuchsite mica that create a shimmering effect known as aventurescence.
- Hardness
- 7 Mohs
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. It is characterized by platy inclusions of Fuchsite mica that create a shimmering effect known as aventurescence.
Formation & geological history
Formed primarily in metamorphic environments where quartz-rich sediment is subjected to high heat and pressure, causing recrystallization. The green color comes from inclusions of chromium-rich mica (Fuchsite). It is commonly associated with magmatic episodes and regional metamorphism.
Uses & applications
Extensively used for ornamental carvings, figurines, beads, and cabochons in jewelry. It is also a popular stone for lapidary artists and tumble polishing. Occasionally used in interior design applications like mosaics.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the 18th-century discovery of Goldstone (aventurine glass). Many people mistake green aventurine for jade, though aventurine is much harder and has a distinctive grainy shimmer.
Field identification & locations
Identify in the field by its quartz-like hardness (scratches glass) and the presence of tiny, sparkly green mica flakes. Major deposits are found in India (the primary source), Brazil, Russia, and Tanzania. Look for it in areas with high-grade metamorphic activity.
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