Webster's Revised Unabridged Dictionary · 1913

Aventurine

Aventurine ({not transcribed}) , noun

[French aventurine: compare Italian 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.
(Mineralogy) A variety of translucent quartz, spangled throughout with scales of yellow mica.
Collocations (1)
Aventurine feldspar , a variety of oligoclase with internal firelike reflections due to the presence of minute crystals, probably of hematite; sunstone.