Dictionary.com
definitions

smoky quartz

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 for smoky quartz

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