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From The Collaborative International Dictionary of English v.0.48:
Aventurine \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. [1913 Webster] 2. (Min.) A variety of translucent quartz, spangled throughout with scales of yellow mica. [1913 Webster] Aventurine feldspar, a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone. [1913 Webster]