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The Sulphates in the cases include glauber salt, or sulphate of soda; heavy spar or sulphates of baryta, among which are some splendid crystallisations from Piedmont, Hungary, Spain, and other countries; sulphate of strontia, known also as celestine, among which are some delicate blue crystals from Sicily; sulphates of lime, as gypsum, including some fine specimens of alabaster, and the fibrous sulphate known vulgarly as tripe-stone.
The name anhydrite was given by A.G. Werner in 1804, because of the absence of water, as contrasted with the presence of water in gypsum. A peculiar variety occurring as contorted concretionary masses is known as tripe-stone, and a scaly granular variety, from Vulpino, near Bergamo, in Lombardy, as vulpinite; the latter is cut and polished for ornamental purposes.
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