metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69; Features a shimmering effect known as aventurescence.
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green; Luster: Vitreous to waxy; Crystal structure: Hexagonal; Cleavage: None; Specific gravity: 2.64-2.69; Features a shimmering effect known as aventurescence.
Formation & geological history
Formed as a metamorphic rock (quartzite) composed of quartz microcrystals with chromium-rich fuchsite mica inclusions, typically found in areas of intense heat and pressure.
Uses & applications
Used primarily for jewelry (beads, cabochons), ornamental carvings, landscaping stones, and as a popular specimen for crystal collectors.
Geological facts
The shimmering effect is caused by platy mineral inclusions like fuchsite mica. While green is the most common color, it can also be found in blue, reddish-brown, and peach shades.
Field identification & locations
Identify by its characteristic sparkling surface when rotated in light and the presence of green mica platelets beneath the surface. Common in India, Brazil, and Russia.
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