metamorphic
Green Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
Hardness: 6.5-7 (Mohs); Color: Pale to dark green with inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69
- Hardness
- 6
- Color
- Pale to dark green with inclusions
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Pale to dark green with inclusions; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.64-2.69
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where the presence of chrome-rich mica (fuchsite) provides the green coloration and platy inclusions.
Uses & applications
Commonly used for lapidary work, decorative carvings (like the mushroom shown), tumbled stones, and semi-precious jewelry beads.
Geological facts
The name 'Aventurine' comes from the Italian word 'a ventura', meaning 'by chance', originally referring to the accidental discovery of aventurine glass (goldstone).
Field identification & locations
Identify by its 'aventurescence' (a shimmering effect caused by light reflecting off mica flakes). Found heavily in India (Karnataka and Andhra Pradesh), Brazil, and Russia.
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