metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69. It exhibits 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
- Hardness
- 6
- Color
- Green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69. It exhibits 'aventurescence,' a shimmering effect caused by platy mineral inclusions.
Formation & geological history
Green aventurine is a form of quartzite. It forms through the regional metamorphism of quartz-rich sedimentary rocks (sandstone), where heat and pressure cause the quartz grains to recrystallize around chromium-rich mica (fuchsite) inclusions.
Uses & applications
Commonly used for ornamental carvings, figurines, jewelry beads, cabochons, and as a popular pocket stone for collectors. It is also used in landscaping and interior design accents.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura,' meaning 'by chance.' This refers to the accidental discovery of 'aventurine glass' in the 18th century, which looked similar to the natural stone.
Field identification & locations
In the field, it is identified by its grainy quartzite texture combined with a distinct green shimmer. It is most commonly found in India (the largest producer), Brazil, and Russia. Collectors should look for the characteristic platy sparkle under light.
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