aventurine

a•ven•tu•rine n.

Ceramicsan opaque, brown glass containing fine, gold-colored particles.
Mineralogyany of several varieties of minerals, esp. quartz or feldspar, spangled with bright particles of mica, hematite, or other minerals.

Also, a•ven′tu•rin. Also called goldstone.

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)
1805–15

Collins Concise English Dictionary © HarperCollins Publishers::

aventurine, aventurin /əˈvɛntjʊrɪn/avanturine /əˈvæntjʊrɪn/ n

a dark-coloured glass, usually green or brown, spangled with fine particles of gold, copper, or some other metal
a variety of quartz containing red or greenish particles of iron oxide or mica: a gemstone

Etymology: 19th Century: from French, from Italian avventurina, from avventura chance; so named because usually found by accident; see adventure

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