a bluish, argillaceous sandstone used for building purposes, flagging, etc.

1645–55; blue + stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bluestone (ˈbluːˌstəʊn)
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
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Example sentences
Pollard said scattered fragments of bluestone have been found in the same area as the new henge.
Crushed drain rock adds a contemporary edge to bluestone pavers.
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