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rock crystal

noun

  1. transparent quartz, especially when colorless.

rock crystal

noun

  1. a pure transparent colourless quartz, used in electronic and optical equipment. Formula: SiO 2
“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
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Word History and Origins

Origin of rock crystal1

First recorded in 1660–70

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