bluestone

[ bloo-stohn ]

/ ˈbluˌstoʊn /

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

Origin of bluestone

First recorded in 1645–55; blue + stone

She walked down the bluestone and blacktop driveway and through shadows thrown by the branches of seven leafless oak trees.

Jimmy Breslin on JFK’s Assassination: Two Classic Columns |Jimmy Breslin |November 22, 2013 |DAILY BEAST
Mrs. Bluestone had begged that at any rate the Countess might see it.

Lady Anna |Anthony Trollope
Dissolve the copper sulphate (bluestone) in twenty-five gallons of water.

Agriculture for Beginners |Charles William Burkett
It consists of copper sulfate, which is commonly called blue vitriol or bluestone, fresh lime and water.

Ginseng and Other Medicinal Plants |A. R. (Arthur Robert) Harding

"And then it will be quite close to Mrs. Bluestone," said Mr. Goffe, who knew of that intimacy.

Lady Anna |Anthony Trollope
"This is very kind of you, Mrs. Bluestone," said Lady Anna, who was sitting crouching in her dressing-gown over the fire.

Lady Anna |Anthony Trollope

bluestone

/ (ˈbluːˌstəʊn) /

a blue-grey sandstone containing much clay, used for building and paving

the blue crystalline form of copper sulphate

a blue variety of basalt found in Australia and used as a building stone