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bluestone |
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bluestone, common name for the blue, crystalline heptahydrate of cupric sulfate cupric 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).
..... Click the link for more information. 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 used commercially for buildings and paving 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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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