metamorphic
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite inclusions)
Hardness: 6.5-7 on Mohs scale; Color: Dull to translucent green with shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Dull to translucent green with shimmering effect (aventurescence); Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.64-2.69.
Formation & geological history
Formed through the regional metamorphism of sandstone into quartzite, where mica crystals (fuchsite) align to create the characteristic green color and shimmer. Most deposits date back to various Precambrian or Paleozoic eras.
Uses & applications
Widely used for ornamental carvings (like the mushroom shown), beads, cabochons for jewelry, figurines, and as a popular 'healing crystal' in metaphysical markets.
Geological facts
The name 'aventurine' comes from the Italian 'a ventura,' meaning 'by chance,' originally referring to the accidental discovery of aventurine glass. The shimmer in green aventurine is specifically caused by platy inclusions of green chromium-rich mica called fuchsite.
Field identification & locations
Identify by its characteristic 'schiller' or sparkly appearance under light. It is commonly found in India, Brazil, Russia, and South Africa. For collectors, look for uniform color and strong aventurescence.
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