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rottenstone
rot·ten·stone [ rótt'n stn ]


noun 
Definition:
 
silica-rich limestone: a form of silica-rich limestone that has been decomposed by weathering and is used in powdered form for polishing metal
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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