metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Hardness: 7 (Mohs scale); Color: Light to dark green; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.69. Known for 'aventurescence,' a shimmering effect caused by mineral platelets.
- Hardness
- 7 (Mohs scale)
- Color
- Light to dark green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: Light to dark green; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.69. Known for 'aventurescence,' a shimmering effect caused by mineral platelets.
Formation & geological history
Formed through the regional metamorphism of quartz-rich sandstone or through hydrothermal activity. Its green color is primarily due to inclusions of chrome-rich fuchsite mica. It is found in deposits millions of years old across various tectonic environments.
Uses & applications
Predominantly used for lapidary work, jewelry (beads, cabochons), carvings, and as a popular stone in the 'healing crystals' market. Also used occasionally in aquarium decor and landscaping.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referring to the 18th-century accidental discovery of aventurine glass (Goldstone), which the natural stone resembles.
Field identification & locations
Identified in the field by its green translucency and internal shimmering speckles (mica inclusions). Common locations include India (the largest producer), Brazil, Russia, and Madagascar. It can be distinguished from jade by its lower density and the presence of mica flakes.
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