#spinel  a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones
  supertype:  #mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  substance:  #magnesium
  subtype:  #spinel_ruby__ruby_spinel  a spinel used as a gemstone (usually dark red)
     subtype:  #almandine  a purple variety of the ruby spinel
     subtype:  #balas_ruby__balasruby__balas__bala  a pale rose-colored variety of the ruby spinel
     subtype:  #rubicelle  a yellow or orange variety of ruby spinel
  subtype:  #Ceylonite__pleonaste  a dark-colored spinel containing iron

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