metamorphic
Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
Hardness: 6.5-7 (Mohs scale); Color: Green (from Fuchsite); Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None; Specific Gravity: 2.64-2.69. Known for aventurescence (a glistening effect).
- Hardness
- 6
- Color
- Green (from Fuchsite)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Green (from Fuchsite); Luster: Vitreous to waxy; Crystal Structure: Trigonal (hexagonal prisms); Cleavage: None; Specific Gravity: 2.64-2.69. Known for aventurescence (a glistening effect).
Formation & geological history
Formed in metamorphic rocks when quartz is subjected to heat and pressure, causing recrystallization. Green aventurine gets its color from chromium-rich mica (fuchsite) inclusions. It dates back millions of years across various geological periods.
Uses & applications
Used extensively in jewelry (beads, cabochons), ornamental carvings, figurines, and as a popular 'healing' stone in spiritual practices. Occasionally used in construction for decorative slabs or landscaping.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the 18th-century discovery of Goldstone (aventurine glass), which the natural stone resembles. It is often called the 'Stone of Opportunity.'
Field identification & locations
Identify by its characteristic 'shimmer' or aventurescence when rotated under light. Usually found in India, Brazil, Russia, and Austria. Collectors should look for vibrant, uniform green color and a strong glittery effect.
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