#barium__Ba__atomic_number_56  a soft silvery metallic element of the alkali earth group; found in barite
  supertype:  #metallic_element__metal  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  substance of:  #heavy_spar
  subtype:  #baryta  any of several compounds of barium
     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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