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smoky quartz

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noun
  1. a smoky-yellow to dark brown or black variety of quartz, used as a gem.

Origin of smoky quartz

First recorded in 1830–40
Also called cairngorm, Cairngorm stone.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for smoky quartz

smoky quartz

noun
  1. another name for cairngorm

Word Origin

so named because of its colour
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