blue·stone

[bloo-stohn]
noun
a bluish, argillaceous sandstone used for building purposes, flagging, etc.

Origin:
1645–55; blue + stone

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
bluestone (ˈbluːˌstəʊn) [Click for IPA pronunciation guide]
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Bluestone is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
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