metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 7 (Mohs scale); Color: Green (pale to dark); Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Quartz; Specific Gravity: 2.64-2.69
- Hardness
- 7 (Mohs scale)
- Color
- Green (pale to dark)
- Luster
- Vitreous to waxy with aventurescence
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Physical properties
Hardness: 7 (Mohs scale); Color: Green (pale to dark); Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Quartz; Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic environments where quartz-rich sediments or igneous rocks under high pressure and heat recrystallize, incorporating chromium-rich fuchsite mica that provides the green color.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, stone flooring, and as a popular meditation or 'healing' stone in spiritual practices.
Geological facts
The shimmering effect seen in aventurine is called 'aventurescence', which is caused by platy mineral inclusions reflecting light. The name comes from the Italian 'a ventura', meaning 'by chance'.
Field identification & locations
Identify by its characteristic green color and shimmering mica-like specks. It is common in India, Brazil, Russia, and Tanzania. Unlike jade, it has a more granular quartz texture.
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