English

Definition of rock crystal noun from the Oxford Advanced Learner's Dictionary

 

rock crystal

 noun
noun
BrE BrE//ˈrɒk krɪstl//
 
; NAmE NAmE//ˈrɑːk krɪstl//
 
[uncountable]
 
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a pure clear form of quartz (= a hard mineral)
See the Oxford Advanced American Dictionary entry: rock crystal