metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. Displays 'aventurescence' due to mica inclusions.
- Hardness
- 7 (Mohs)
- Color
- Pale to deep green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs); Color: Pale to deep green; Luster: Vitreous to waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.64-2.69. Displays 'aventurescence' due to mica inclusions.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where platey mineral inclusions (mica) are trapped within the quartz matrix. Most deposits range from millions to hundreds of millions of years in age.
Uses & applications
Extensively used in lapidary work for tumbled stones, carvings, beads, and jewelry. Also used as decorative building stone (aventurine-quartzite) and in ornamental objects.
Geological facts
The name 'Aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' referring to the 18th-century accidental discovery of aventurine glass (goldstone) which it resembles.
Field identification & locations
Identify by its characteristic green shimmer when tilted under light. Commonly found in India (the largest producer), Brazil, Russia, and Tanzania. Collectors should look for even color saturation and a strong sparkly effect.
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