metamorphic
Green Aventurine (Tumbled Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Hardness: 6.5-7 (Mohs scale); Color: Pale to forest green with slight shimmering (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to forest green with slight shimmering (aventurescence)
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Pale to forest green with slight shimmering (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None; Specific Gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) become trapped within the mineral matrix. Common in Precambrian and Paleozoic geological units.
Uses & applications
Predominantly used for lapidary work, cabochons, ornamental carvings, decorative landscaping, and as a popular semi-precious stone for jewelry and meditation.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referring to the accidental discovery of aventurine glass in the 18th century, which this natural stone happens to resemble.
Field identification & locations
Identify by its 'aventurescence,' a distinct metallic shimmer caused by platey mineral inclusions. Can be found in the field near metamorphic schist or quartzite deposits, particularly in India, Brazil, and Russia.
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