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ideal crystal
i·de·al crys·tal (plural i·de·al crys·tals)


noun 
Definition:
 
crystal without imperfections or impurities: a crystal without structural imperfections or impurities
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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