metamorphic
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 6.5–7 (Mohs scale), Color: Dull to medium green with shimmery flecks, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal) microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.64–2.69
- Hardness
- 6
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Physical properties
Hardness: 6.5–7 (Mohs scale), Color: Dull to medium green with shimmery flecks, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal) microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.64–2.69
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone. High-pressure and temperature conditions cause recrystallization of quartz grains, while the presence of chromium-rich mica (fuchsite) provides the green coloration. It is primarily found in Proterozoic and Archean age rock formations.
Uses & applications
Predominantly used for lapidary work, jewelry (beads, cabochons), ornamental carvings (figurines), and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
The characteristic shimmer seen in this stone is called 'aventurescence,' caused by light reflecting off tiny platelets of green mica. It is often mistaken for jade, though it is significantly harder and has a different internal structure.
Field identification & locations
Identify in the field by its distinct green hue, lack of visible crystals (microcrystalline), and the presence of internal sparkles when rotated under light. Major deposits are found in India, Brazil, Russia, and South Africa. Collectors should look for uniform color and high aventurescence.
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