- a blue-gray sandstone that is easily split into thin slabs, used as flagstone
- copper sulfate
- A bluish-gray sandstone used for paving and building.
- A stone similar to this kind of sandstone.
(countable and uncountable, plural bluestones)
- (UK) A form of dolerite which appears blue when wet or freshly broken.
- (UK) Any of several massive stones used to construct Stonehenge.
- (US) A feldspathic sandstone in the U.S.
- (US) A form of limestone native to the Shenandoah Valley
- (Australia) A basalt or olivine basalt.
- (Australia, South Australia) Slate from quarries in or near Adelaide.
- blue notes
- On the Pocono plateau is a large deposit of a finegrained dark-blue stone of the Devonian formation which is known as the Wyoming Valley stone, and, like the New York " bluestone," which it closely resembles, is much used for window and door trimmings, steps and flagging.
- Gibson and begun in 1883; St Peter's Episcopal Church (French Gothic), of Hudson River bluestone; Emmanuel Baptist Church, of white granite; the Madison Avenue Reformed Church; and St Joseph's (Roman Catholic), of bluestone and Caen stone with marble trimmings.
- In 1908 the value of Pennsylvania sandstone and bluestone was $1,368,784.
- Granite, bluestone, limestone and slate abound in the neighbourhood.
- The Anglican church of St Mary is built of Oamaru and bluestone, with a roof of kauri wood.