metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Hardness: 6.5 - 7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64 - 2.69
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy with aventurescence
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Physical properties
Hardness: 6.5 - 7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy with aventurescence; Crystal structure: Trigonal/Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.64 - 2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where chromium-rich mica (fuchsite) is incorporated into the quartz matrix. The green color is derived from these mica inclusions.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), ornamental carvings, countertops, and widely collected for its metaphysical associations with luck and prosperity.
Geological facts
The name comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of 'aventurine glass' in the 18th century. It is known for its shimmering effect called 'aventurescence.'
Field identification & locations
Identify by its characteristic grainy, sugary texture and shimmering internal sparkles from mica flakes. Common locations include India, Brazil, and Russia. Collectors value deep green specimens with high sparkle.
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