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单词 gypsum
释义 gypsum
[`jip·sǝm]
MINERALOGY
CaSO4⋅2H2O A mineral, the commonest sulfate mineral; crystals are monoclinic, clear, white to gray, yellowish, or brownish in color, with well-developed cleavages; luster is subvitreous to pearly, hardness is 2 on Mohs scale, and specific gravity is 2.3; it is calcined at 190-200°C to produce plaster of paris.
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