metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 7 Mohs; Color: Pale to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal Structure: Trigonal (granular quartz aggregate); Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 7 Mohs
- Color
- Pale to dark green with a shimmering effect
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Pale to dark green with a shimmering effect; Luster: Vitreous to waxy; Crystal Structure: Trigonal (granular quartz aggregate); Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed during the metamorphism of quartz-rich sedimentary rocks (sandstone), where heat and pressure recrystallize the quartz and incorporate platy mica minerals like fuchsite.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), tumbled stones, ornamental carvings, and aquarium gravel.
Geological facts
Green aventurine is often called the 'Stone of Opportunity.' Its shimmering metallic luster is caused by light reflecting off tiny inclusions of green fuchsite mica, a phenomenon known as aventurescence.
Field identification & locations
Identify in the field by its characteristic 'shimmer' or aventurescence and its ability to scratch glass. It is commonly found in India (the primary source), Brazil, and Russia.
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