rock crystal

noun
transparent quartz, especially when colorless.

Origin:
1660–70

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World English Dictionary
rock crystal
 
n
a pure transparent colourless quartz, used in electronic and optical equipment. Formula: SiO2

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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