metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69; Notable for its 'aventurescence' (shimmering effect).
- Hardness
- 7 (Mohs scale)
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69; Notable for its 'aventurescence' (shimmering effect).
Formation & geological history
Formed as a quartzite rock through the metamorphism of quartz sandstones. It is formed during high temperature and pressure environments where platy mineral inclusions like mica align and give the rock its unique shimmer.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, landscaping, and as a popular 'healing' stone in metaphysical practices.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance'. This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looked like the natural mineral.
Field identification & locations
Identify in the field by its green color and the presence of tiny, shimmering metallic inclusions. Commonly found in India, Brazil, Russia, and Tanzania. Look for its granular, sugary texture combined with mica-rich plates.
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