metamorphic
Green Aventurine
Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 on Mohs scale; Color: Dull green to vibrant emerald green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It is known for its 'aventurescence' (a shimmering or glistening effect caused by platy mineral inclusions).
- Hardness
- 7 on Mohs scale
- Color
- Dull green to vibrant emerald green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Dull green to vibrant emerald green; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69. It is known for its 'aventurescence' (a shimmering or glistening effect caused by platy mineral inclusions).
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where the inclusion of chrome-rich mica (fuchsite) during the recrystallization process provides the green color. It typically occurs in metamorphic rocks across various geological eras.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, ornamental carvings, aquarium gravel, and as a popular 'healing stone' in the metaphysical market. Occasionally used in interior design as decorative tiles.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to 'aventurine glass' (goldstone) which was discovered by accident before the natural mineral was named after it. It is often called the 'Stone of Opportunity.'
Field identification & locations
Identify in the field by its distinct green color combined with 'aventurescence' (shimmering internal sparkles). Common locations include India (the largest producer), Brazil, Russia, and Austria. Collectors should look for a gritty, sugary texture on raw surfaces and a glassy shine on broken edges.
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