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bluestone

[bloo-stohn] /ˈbluˌstoʊn/
noun
1.
a bluish, argillaceous sandstone used for building purposes, flagging, etc.
Origin
1645-1655
1645-55; blue + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blue stone

bluestone

/ˈbluːˌstəʊn/
noun
1.
a blue-grey sandstone containing much clay, used for building and paving
2.
the blue crystalline form of copper sulphate
3.
a blue variety of basalt found in Australia and used as a building stone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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