metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 (Mohs scale), Color: Pale to dark green (shimmering), Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Specific gravity: 2.64-2.69. Known for aventurescence (a metallic glitter).
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Pale to dark green (shimmering), Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Specific gravity: 2.64-2.69. Known for aventurescence (a metallic glitter).
Formation & geological history
Formed in metamorphic rocks where quartzite is subjected to high pressure and temperature. The green color comes from inclusions of chrome-rich mica (fuchsite) during the recrystallization process.
Uses & applications
Primarily used for ornamental carvings, tumble stones, holistic/spiritual purposes, and jewelry such as beads, cabochons, and egg-shaped decorative pieces.
Geological facts
Aventurine's name comes from the Italian 'a ventura', meaning 'by chance', originally referring to 'Aventurine glass' which was unintentionally invented in the 18th century before the mineral was named.
Field identification & locations
Identify by its characteristic 'aventurescence' (shimmer) when rotated under light. Common in India, Brazil, and Russia. It lacks the toughness of jade and is harder than fluorite.
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