metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)3Si3O10(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green with speckles; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to medium green with speckles
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green with speckles; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (granular aggregate); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where the inclusion of chrome-rich mica (Fuchsite) provides the green coloration. It is primarily found in metamorphic rock formations millions of years old.
Uses & applications
Commonly used in the gemstone industry for cabochons, beads, and carvings. Also used as an ornamental stone in landscaping, aquarium decor, and widely collected for metaphysical or decorative purposes.
Geological facts
Aventurine displays a unique shimmering effect known as 'aventurescence,' which is caused by light reflecting off tiny platy inclusions of mica within the stone.
Field identification & locations
Identify in the field by its sugary/granular texture and the presence of shimmering mica flakes when rotated under light. Common locations include India (the primary producer), Brazil, Russia, and Tanzania. Collectors should look for uniform color and strong aventurescence.
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