metamorphic
Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)
Hardness: 6.5–7 on the Mohs scale; Color: Pale green to medium green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (granular texture); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64–2.69
- Hardness
- 6
- Color
- Pale green to medium green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on the Mohs scale; Color: Pale green to medium green; Luster: Vitreous to waxy; Crystal Structure: Trigonal (granular texture); Cleavage: None (conchoidal fracture); Specific Gravity: 2.64–2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. It recrystallizes under high heat and pressure, incorporating mica minerals like fuchsite that provide the signature green color and 'aventurescence' (shimmer). Found in ancient metamorphic belts globally.
Uses & applications
Used primarily for lapidary work, cabochons for jewelry, ornamental carvings, aquarium gravel, and as a popular 'healing stone' in metaphysical practices.
Geological facts
The name comes from the Italian word 'a ventura', meaning 'by chance', which originally referred to the accidental discovery of goldstone (Italian glass) that looked similar. It is often called 'The Gambler's Stone' and is believed by some to bring luck and prosperity.
Field identification & locations
Identify in the field by its speckled green appearance and slightly sparkly/shimmery effect when tilted in light. It is harder than glass. Common locations include India (largest producer), Brazil, Russia, and Tanzania. Collectors should look for even distribution of green color and a strong shimmer.
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