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rock crystal

transparent quartz, especially when colorless.
1660-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for rock crystal
  • It is so common that they prefer for ornamental purposes rock crystal, of which all the columns were made.
  • Crack is cocaine hydrochloride powder that has been processed to form a rock crystal that is then usually smoked.
  • The rock crystal form of quartz is of great value to the electronics industry.
  • Crack cocaine is cocaine that has been processed from cocaine hydrochloride into a rock crystal form that can be smoked.
British Dictionary definitions for rock crystal

rock crystal

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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