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rock crystal

noun
1.
transparent quartz, especially when colorless.
Origin of rock crystal
1660-1670
1660-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for rock crystal

rock crystal

noun
1.
a pure transparent colourless quartz, used in electronic and optical equipment. Formula: SiO2
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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10
11
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