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aventurine

or a·ven·tu·rin

[uh-ven-chuh-reen, -rin]
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noun
  1. an opaque, brown glass containing fine, gold-colored particles.
  2. any of several varieties of minerals, especially quartz or feldspar, spangled with bright particles of mica, hematite, or other minerals.
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Origin of aventurine

1805–15; < French, equivalent to aventure chance (see adventure) + -ine -ine2; so called because metal particles are introduced into the molten glass pell-mell (à l'aventure)
Also called goldstone.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aventurine

aventurine

aventurin avanturine (əˈvæntjʊrɪn)

noun
  1. a dark-coloured glass, usually green or brown, spangled with fine particles of gold, copper, or some other metal
  2. Also called: sunstone a light-coloured translucent variety of orthoclase feldspar containing reddish-gold particles of iron compounds
  3. a variety of quartz containing red or greenish particles of iron oxide or mica: a gemstone
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Word Origin

C19: from French, from Italian avventurina, from avventura chance; so named because usually found by accident; see adventure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012