#calcium_sulphate__calciumsulphate__calcium_sulfate__calciumsulfate  a white salt (CaSO4)
  supertype:  #salt  a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)
  subtype:  #plaster_of_Paris__plaster  any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs

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