bluestone

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bluestone,

common name for the blue, crystalline heptahydrate of cupric sulfatecupric sulfate
or copper (II) sulfate,
chemical compound, CuSO4, taking the form of white rhombohedral crystals or amorphous powder. It decomposes at 650°C; to cupric oxide (CuO).
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 called chalcanthite, a minor ore of copper. It also refers to a fine-grained, light to dark colored blue-gray sandstonesandstone,
sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz sandstones
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. Deposits are extensively quarried as flagstone (paving stone) in New York and Pennsylvania and used commercially for buildings and paving stone.

bluestone

A dense fine-grained sandstone that splits easily along bedding planes to form thin slabs. See also: Stone

bluestone

[′blü‚stōn]
(mineralogy)
(petrology)
A sandstone that is highly argillaceous and of even texture and bedding.
The commercial name for a feldspathic sandstone that is dark bluish gray; it is easily split into thin slabs and used as flagstone.

bluestone

A hard, fine-grained, commonly feldspathic and micaceous sandstone or siltstone of dark greenish to bluish gray color that splits readily along bedding planes to form thin slabs; commonly used to pave surfaces for pedestrian traffic. A variety of flagstone.