metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 Mohs; Color: Pale to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by mineral inclusions).
- Hardness
- 7 Mohs
- Color
- Pale to forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Pale to forest green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69; Distinctive feature: Aventurescence (shimmer caused by mineral inclusions).
Formation & geological history
Formed as a metamorphic rock (quartzite) through the intense heat and pressure of regional metamorphism. Its specific green color is caused by platy inclusions of chromium-rich mica known as Fuchsite. Formation can range from hundreds of millions to billions of years old.
Uses & applications
Primarily used for ornamental purposes, including jewelry (cabochons and beads), decorative carvings, aquarium gravel, and as a popular stone in the metaphysical market for 'good luck'.
Geological facts
Aventurine's name comes from the Italian 'a ventura', meaning 'by chance', originally referring to an 18th-century accidental discovery of 'goldstone' glass which looked similar. It is often mistaken for jade by casual observers.
Field identification & locations
Identify in the field by its grainy, sugary texture and characteristic 'sparkle' when rotated under light. It is commonly found in India (the largest producer), Brazil, Russia, and Tanzania. To distinguish it from Green Quartz, look for the mica-induced shimmer.
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