metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on the Mohs scale. Color: Green with a shimmering 'aventurescence'. Luster: Vitreous/Waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.64-2.69.
- Hardness
- 6
- Color
- Green with a shimmering 'aventurescence'
- Luster
- Vitreous/Waxy
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Green with a shimmering 'aventurescence'. Luster: Vitreous/Waxy. Crystal structure: Trigonal (microcrystalline). Cleavage: None. Specific gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. Its green color and signature shimmer come from chromium-rich mica (fuchsite) platelets that align during crystallization. Found in deposits varying from millions to billions of years old.
Uses & applications
Used primarily in lapidary arts for jewelry (cabochons, beads), decorative carvings, aquarium decorations, and as a popular 'healing stone' in the metaphysical industry.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass (goldstone) in the 18th century, which the natural stone resembles.
Field identification & locations
Identify in the field by its grainy, sugary quartzite texture combined with a distinct sparkling effect (aventurescence) when turned under light. Found commonly in India, Brazil, and Russia. Collectors should look for even color distribution and strong sparkle.
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