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rock hound
rock hyrax
Rock Island
rock lobster
rock maple
rock mechanics
rock moss
rock music
rock’n’roll
rock oil
rock pigeon
rock plant
rock rabbit
rock-ribbed
rock salt
rock snake
rock-solid
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rock crystal
rock crys·tal (plural rock crys·tals)


noun 
Definition:
 
colorless transparent variety of quartz: a colorless transparent variety of quartz. Use: electronic and optical instruments.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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