metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions of Fuchsite mica; Chemical formula: SiO2 + K(Al,Cr)2AlSi3O10(OH)2
Hardness: 6.5-7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Features 'aventurescence' (a metallic glitter effect).
- Hardness
- 6
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69; Features 'aventurescence' (a metallic glitter effect).
Formation & geological history
Forming through the regional metamorphism of sandstone into quartzite, where the chromium-rich mica 'fuchsite' is incorporated into the quartz matrix, providing the green hue and shimmer.
Uses & applications
Predominantly used for lapidary work, jewelry (beads, cabochons), carvings, sculptures, and as a popular ornamental stone for collectors and metaphysical use.
Geological facts
The name 'Aventurine' is derived from the Italian 'a ventura,' meaning 'by chance.' This refers to the 18th-century accidental discovery of aventurine glass (goldstone), which the natural mineral was later named after due to its similar glittery appearance.
Field identification & locations
Identify in the field by its grainy, sugary texture when unpolished and its distinct internal shimmer (aventurescence) caused by light reflecting off mica platelets. Common locations include India, Brazil, Tanzania, and Russia.
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