#baryta  any of several compounds of barium
  supertype:  #barium__Ba__atomic_number_56  a soft silvery metallic element of the alkali earth group; found in barite
  subtype:  #barium_hydroxide  white poisonous crystals; made by dissolving barium oxide in water
  subtype:  #barium_monoxide__barium_oxide__barium_protoxide  an oxide of barium; a whitish toxic powder
  subtype:  #barium_dioxide__barium_peroxide  a white toxic powder obtained by heating barium oxide in air

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