metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 7 Mohs; Color: Green with shimmering spots (aventurescence); Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 7 Mohs
- Color
- Green with shimmering spots (aventurescence)
- Luster
- Vitreous
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Physical properties
Hardness: 7 Mohs; Color: Green with shimmering spots (aventurescence); Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock, specifically a quartzite, where high pressure and temperature cause quartz grains to recrystallize around mica inclusions like fuchsite.
Uses & applications
Commonly used for ornamental carvings, tumble-polished stones, beads for jewelry, and as a popular stone in metaphysical collecting.
Geological facts
The name comes from the Italian 'a ventura' meaning 'by chance', originally referring to accidental aventurine glass production in the 18th century. Most green specimens owe their color to chromiferous mica known as fuchsite.
Field identification & locations
Identify by its 'schiller' or sparkly appearance within the stone. Found primarily in India, Brazil, and Russia. It can be distinguished from jade by its lower toughness and the presence of mica flakes.
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