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rock bottom
rock brake
rock cake
rock candy
rock climb
rock climbing
Rock Cornish
rock crab
rock crystal
rock dove
rock elm
rock face
rock flour
rock garden
rock-hard
Rock Hill
rock hound
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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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