bluestone

bluestone,

common name for the blue, crystalline heptahydrate of cupric sulfate called chalcanthite, a minor ore of copper. It also refers to a fine-grained, light to dark colored blue-gray sandstone. Deposits are extensively quarried as flagstone (paving stone) in New York and Pennsylvania and used commercially for buildings and paving stone.

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bluestone

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

Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

bluestone

[′blü‚stōn]

(mineralogy)

chalcanthite

(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.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.