metamorphic
Green Aventurine (Fuchsite-bearing Quartz)
Silicon Dioxide with Chromium-rich Muscovite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5-7 on Mohs scale; Color: Green to white mottled; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69.
- Hardness
- 6
- Color
- Green to white mottled
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Green to white mottled; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite. The green color is derived from inclusions of Fuchsite mica that grew within the quartz matrix during the metamorphic process under high pressure and temperature.
Uses & applications
Mostly used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and widely sold in the metaphysical 'healing' crystal market.
Geological facts
Aventurine is named for the 'aventurescence' effect, a shimmering or glistening look caused by light reflecting off the tiny mica flakes embedded inside. While most common in green, it can also be found in blue, orange, and red depending on the mineral inclusions.
Field identification & locations
Identify by its characteristic 'shimmer' when rotated under light (aventurescence) and its inability to be scratched by a steel knife. Commonly found in India, Brazil, and Russia.
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