metamorphic
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)
Hardness: 6.5–7 (Mohs scale); Color: Green (due to Chromium-rich mica); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.6–2.7.
- Hardness
- 6
- Color
- Green (due to Chromium-rich mica)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Green (due to Chromium-rich mica); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.6–2.7.
Formation & geological history
Formed in metamorphic environments where quartz-rich sediments or igneous rocks are subjected to heat and pressure, causing recrystallization. Green varieties form specifically when Fuchsite mica is present during the process.
Uses & applications
Commonly used for ornamental carvings, polished spheres, cabochons for jewelry, and as a popular stone for meditation and crystal collecting.
Geological facts
Aventurine is known for its 'aventurescence,' a shimmering effect caused by platy mineral inclusions (like mica) reflecting light within the quartz. The name comes from the Italian 'a ventura,' meaning 'by chance.'
Field identification & locations
Identify by its characteristic green color and shimmering mica inclusions. It is harder than glass and does not have the fibrous structure of jade. Commonly found in India, Brazil, and Russia.
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