metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green; Luster: Vitreous to greasy/shimmering (aventurescence); Crystal: Hexagonal/Trigonal system; Specific Gravity: 2.64-2.69; Cleavage: None.
- Hardness
- 6
- Color
- Pale to medium green
- Luster
- Vitreous to greasy/shimmering (aventurescence)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to medium green; Luster: Vitreous to greasy/shimmering (aventurescence); Crystal: Hexagonal/Trigonal system; Specific Gravity: 2.64-2.69; Cleavage: None.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. Its distinctive green color and shimmering effect are caused by platey inclusions of mica (fuchsite) during recrystallization. These specimens can range in age from hundreds of millions to even billions of years old.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), landscaping stones, and carvings. It is very popular in the metaphysical community as a 'stone of opportunity'.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura' (by chance), referring to the accidental discovery of 'aventurine glass' in Venice, which looked similar to this natural stone. Its shimmering 'aventurescence' is its most famous optical trait.
Field identification & locations
Identify in the field by its grainy, sugary texture and the way metallic mica flakes sparkle under light. It is commonly found in India (the largest producer), Brazil, Russia, and Tanzania. Unlike Jade, it often has visible granular quartz structures.
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