bluestone

Definition of Bluestone in English :

1. bluestone

bluish-grey sandstone used for paving and building

WordNet Lexical Database for English. Princeton University. 2010.

Bluestone

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

noun

1. US

a blue-gray sandstone that is easily split into thin slabs, used as flagstone

2.

copper sulfate

3.

chalcanthite

n.

1. A bluish-gray sandstone used for paving and building.

2. A stone similar to this kind of sandstone.