\A*ven"tu*rine\, n. [F. aventurine: cf. It.
avventurino.]
1. A kind of glass, containing gold-colored spangles. It was
   produced in the first place by the accidental (par
   aventure) dropping of some brass filings into a pot of
   melted glass.
2. (Min.) A variety of translucent quartz, spangled
   throughout with scales of yellow mica.
{Aventurine feldspar}, a variety of oligoclase with internal
   firelike reflections due to the presence of minute
   crystals, probably of hematite; sunstone.