metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
Hardness: 6.5-7 on Mohs scale; Color: Green (due to Chromium-rich mica); Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69. Displays aventurescence (a metallic glitter).
- Hardness
- 6
- Color
- Green (due to Chromium-rich mica)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Green (due to Chromium-rich mica); Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64-2.69. Displays aventurescence (a metallic glitter).
Formation & geological history
Formed in metamorphic environments where quartz-rich sediments are subjected to high pressure and heat, causing the quartz to recrystallize around mica plates. Generally associated with ancient Precambrian shield areas.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), ornamental carvings, stone therapy, and landscaping.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura', meaning 'by chance', referring to the accidental discovery of aventurine glass (goldstone) in the 18th century, which looks similar to the natural stone.
Field identification & locations
Identify in the field by its green color and 'aventurescence' (shimmering effect). Look for it in areas with metamorphic rock like gneiss or schist. Common locations include India (largest producer), Brazil, and Russia.
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