mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 6.5-7 (Mohs); Color: Green (due to Chromium-rich mica); Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Green (due to Chromium-rich mica)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Green (due to Chromium-rich mica); Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Specific Gravity: 2.64-2.69
Formation & geological history
Formed in metamorphic rocks and igneous environments where silica-rich fluids cool and crystallize, often incorporating mica flakes that create the aventurescence effect.
Uses & applications
Mainly used for ornamental purposes, jewelry (beads, cabochons), carvings, and as a popular stone in the metaphysical and gemstone collecting community.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura', meaning 'by chance', originally referring to Italian glass made by accidentally dropping copper filings into molten glass.
Field identification & locations
Identify by its characteristic 'aventurescence' (a metallic glitter) and grainy quartz texture. Common in India, Brazil, and Russia. Beginners can use the hardness test (it will scratch glass).
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