metamorphic
Green Aventurine (Gua Sha tool)
Quartzite with Fuchsite inclusions (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 (granular); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69
- 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 (granular); Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69
Formation & geological history
Formed as a metamorphic rock (quartzite) where original quartz sandstones were subjected to intense heat and pressure, with the green color provided by inclusions of chromium-rich muskcovite mica known as fuchsite.
Uses & applications
Used primarily in lapidary arts for decorative carvings, jewelry, figurines, and holistic wellness tools like the Gua Sha facial massager seen in the image.
Geological facts
The name comes from the Italian 'a ventura', meaning 'by chance', originally referring to the accidental discovery of goldstone glass. Natural aventurine is known for 'aventurescence', a shimmering effect caused by light reflecting off mineral inclusions.
Field identification & locations
Commonly found in India, Brazil, and Russia. Identifying marks include its granular texture and 'platy' green reflections. For collectors, it is valued for its color saturation and translucency.
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