metamorphic
Green Aventurine
Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69. It features aventurescence (a glistening effect).
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (Trigonal); Cleavage: None; Specific gravity: 2.64-2.69. It features aventurescence (a glistening effect).
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. Its green color and signature sparkle are caused by inclusions of chrome-rich mica known as Fuchsite. It is typically found in Precambrian metamorphic terrains.
Uses & applications
Commonly used for ornamental carvings, gemstones for jewelry (beads, cabochons), landscaping stones, and widespread use in the 'healing crystal' and metaphysical market.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of goldstone glass in the 18th century, which this natural stone resembles.
Field identification & locations
Field identification is based on its green speckling and the internal 'shimmer' when rotated under light. It is commonly found in India (the largest producer), Brazil, Russia, and Tanzania.
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