metamorphic
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 (Mohs scale); Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Features 'aventurescence' (shimmer).
- Hardness
- 7 (Mohs scale)
- Color
- Pale to dark green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Features 'aventurescence' (shimmer).
Formation & geological history
Formed through regional metamorphism where quartz is subjected to high heat and pressure, causing it to recrystallize. The green color comes from the inclusion of chromium-rich mica called Fuchsite.
Uses & applications
Used widely in lapidary work, jewelry (beads, cabochons, carvings), ornamental home decor, and by collectors or practitioners for its metaphysical associations.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looked similar to the natural stone.
Field identification & locations
Identify in the field by its distinct green color and plate-like inclusions of mica that reflect light. It lacks the internal 'bubbles' found in glass and is harder than most common green minerals like fluorite. Commonly found in India, Brazil, Russia, and Tanzania.
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