mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 6.5-7 (Mohs scale), Color: Green with aventurescence (shimmer), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Green with aventurescence (shimmer), Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock, specifically a quartzite, where silica-rich fluids permeate and crystallize with inclusions of green fuchsite mica, which gives it the characteristic color and sparkle.
Uses & applications
Used widely in ornamental carvings, jewelry (beads, cabochons), tumbled stones for collecting, and as a decorative stone in architecture.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' referencing the discovery of aventurine glass in the 18th century, which looks remarkably like the natural stone.
Field identification & locations
Look for the metallic 'spangles' or shimmer known as aventurescence. Commonly found in India, Brazil, Russia, and Tanzania. Often confused with jade or emerald, but the shimmer is a key identifier.
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