A grayish blue building stone, as that commonly used in the eastern United States.
A variety of flagstone, used for paving, this blue, gray or green sandstone splits easily into thin slabs.
A hard sandstone of characteristic blue, gray, green brown and rust colors, quarried in the states of New York and Pennsylvania .
a dense, hard, fine-grained, commonly feldspatic sandstone or siltstone of medium to dark or bluish-gray colour that splits readily along original bedding planes to form thin slabs, Bluestone is not a technical geologic term. It is considered to be a variety of flagstones, the thin relatively smooth-surfaced slabs being suitable for use as flagging. The term has been applied particularly to sandstone of Devonian age that is being or has been quarried in eastern New York and Pennsylvania and in western New Jersey, but similar stones that occur elsewhere may be included. It has also been applied in places to thinly layered gneisses and schist that can be split and used as flagging, but such stones are not properly embraced by this definition although they may be marketed properly as flagstone. [Go to source
bluish-gray sandstone used for paving and building
A blue to bluish-green argillaceous metamorphic sandstone of even texture and bedding, historically quarried neat the Hudson River.
A dark, fine-grained igneous rock, usually quarried from Western Victoria and often used for plinths, window and door sills and occasionally for walls.
a bluish stone used for the inner horseshoe of Stonehenge
A dense, fine grained commonly feldspathic sandstone or siltstone of characteristic blue, gray, plum, and/or brown colors that splits readily along original bedding planes to form thin slabs. Example: Bluestone
Bluish or blue-gray argillaceous sandstone, usually very fine grained and very durable. Used for lintels and sills.
