bassanite
noun
bas·sa·nite
bə-ˈsä-ˌnīt
plural -s
: a mineral CaSO4‧¹/₂H2O consisting of calcium sulfate found in white opaque crystals in blocks ejected from Vesuvius in 1906 (specific gravity 2.69–2.76) compare plaster of paris
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Merriam-Webster unabridged
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