Aventurine is a variety of quartz.
Aventurine is a translucent to opaque variety of microcrystalline quartz. It contains small inclusions of shiny min-erals which give the stone a sparkling effect known as aventurescence. Inclusions of mica will give a silverish sheen, while inclusions of hematite give a reddish or grayish sparkle. This mineral is often mistaken for amazonite or jade.
It is interesting that the name for the stone is derived from an accident. Sometime during the 18th century, Venetian glass workers were preparing molten glass when copper filings accidentally fell into the batch producing a glass with sparkles. The name aventurine comes from the Italian "a ventura," which means "by chance".
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