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smectite
smec·tite [ smék tt ]


noun 
Definition:
 
clay mineral: a clay mineral belonging to the group that swell in water. Use: ion exchange materials.
[Early 19th century. < Greek smēktis "fuller's earth"]
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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