metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
Hardness: 7 (Mohs scale); Color: Pale to dark green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69; Notable for 'aventurescence' (shimmering effect).
- 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 (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69; Notable for 'aventurescence' (shimmering effect).
Formation & geological history
Formed as a metamorphic rock, specifically a quartzite, where high pressure and temperature cause recrystallization. The green color and shimmer are caused by tiny flaky inclusions of Fuchsite (chromium-rich mica).
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, ornamental stone in construction, and heavily used in the holistic/metaphysical market.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura' meaning 'by chance', originally referring to accidental discovery of aventurine glass in the 18th century before the natural mineral was named.
Field identification & locations
Identify by its distinct green hue and internal 'glittery' reflections (aventurescence). Commonly found in India (the largest producer), Brazil, and Russia. Unlike Jade, it often shows grainy quartz textures and mica flakes.
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