metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 (Mohs scale); Color: Dull to dark green with a grainy texture; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69
- Hardness
- 7 (Mohs scale)
- Color
- Dull to dark green with a grainy texture
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Dull to dark green with a grainy texture; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where interstitial mica (fuchsite) provides the green coloration and platy texture.
Uses & applications
Used primarily in lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a popular stone for chakra healing and rock collecting.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass. The 'shimmer' seen in polished pieces is called aventurescence.
Field identification & locations
Identify by its characteristic green color and granular, quartzite-like fracture. It is commonly found in India, Brazil, and parts of Russia. Look for mica inclusions that catch the light.
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