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Aventurine

n.
  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.
    3. Aventurine feldspar ,
    a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone.