#gypsum  a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris)
  supertype:  mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  substance:  calcium
  substance of:  plaster_of_Paris
  subtype:  alabaster  a compact fine-textured usually white gypsum used for carving
  subtype:  terra_alba__terraalba  finely pulverized gypsum used especially as a pigment

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