Green Aventurine:
Aventurine is a variety of Quartz characterized by bright inclusions of Mica or other minerals that give a shimmering or glistening effect to the stone, referred to as aventurescence, especially notable when tumbled or polished. Its name is derived from the Italian a ventura or all’avventura, meaning "by chance," and refers to the Italian glass from the 1700s, produced when a worker accidentally dropped metal filings into a vat of melting glass. Once cooled, the result was pleasing with its randomly spaced iridescent sparkles, and it was used to make jewelry and other items. The name Aventurine was later given to the natural stone which looked like an industrial product.
Aventurine is most commonly green, though it also forms in blue, red to reddish-brown, dusty purple, orange or peach, yellow, and silver-gray. It is mostly translucent and often banded, but an overabundance of an included mineral may render it opaque.
The color of Green Aventurine comes from Fushite particles within the Quartz, while shades of red, brown, and orange are attributed to Hematite or Goethite inclusions. Peach and yellow Aventurine include Pyrite with their Mica crystals, Blue Aventurine contains inclusions of Dumortierite, while the purple variety is colored by Lepidolite.
