metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Hardness: 7 Mohs; Color: Forest green to translucent green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69. Known for 'aventurescence' (shifting metallic glitter caused by plating mica inclusions).
- Hardness
- 7 Mohs
- Color
- Forest green to translucent green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Forest green to translucent green; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None; Specific Gravity: 2.64-2.69. Known for 'aventurescence' (shifting metallic glitter caused by plating mica inclusions).
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where high pressure and temperature crystalline the silica while incorporating chromium-rich fuchsite mica. This specimen appears water-worn or mechanically tumbled.
Uses & applications
Primarily used for ornamental purposes, jewelry (beads, cabochons), carvings, and broadly as a 'healing stone' in metaphysical practices. Occasionally used in interior design for tiles or countertops.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura' (by chance), referring to the accidental discovery of goldstone glass in the 18th century, which looks very similar to this natural mineral.
Field identification & locations
Identify by its characteristic green 'shimmer' when rotated under light. It is commonly found in India (where it's sometimes called 'Indian Jade'), Brazil, and Russia. Collectors should look for even color distribution and strong aventurescence.
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