metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 (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. Displays 'aventurescence' (a shimmering effect).
- Hardness
- 7 (Mohs scale)
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (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. Displays 'aventurescence' (a shimmering effect).
Formation & geological history
Formed as a quartzite through the metamorphism of sandstone, where fuchsitic mica inclusions grow within the quartz matrix. It is found in ancient metamorphic rock layers dating back hundreds of millions of years in regional metamorphic belts.
Uses & applications
Commonly used in jewelry (beads, cabochons), ornamental carvings, stone building veneers, and as a popular semi-precious stone for collectors and metaphysical practitioners.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' which originally referred to the 18th-century accidental discovery of aventurine glass (goldstone) before the natural mineral was named.
Field identification & locations
Identify by its characteristic green color and shimmering mica speckles visible under light. Commonly found in India (leading producer), Brazil, and Russia. When raw, it looks like a grainy green quartz; when tumbled (as pictured), it is smooth and translucent.
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