#corundom__corundum  very hard mineral used as an abrasive
  supertype:  mineral  solid homogeneous inorganic substances occurring in nature having a definite chemical composition
  substance of:  emery
  subtype:  alumina__aluminumoxide__aluminiumoxide  any of various forms of aluminum oxide occurring naturally as corundum
     subtype:  alundum  a substance made of fused alumina
  subtype:  ruby.corundom  a transparent deep red variety of corundum; used as a gemstone and in lasers
  subtype:  sapphire.corundom  a precious transparent stone of rich blue corundum valued as a gemstone
     subtype:  star_sapphire  a sapphire that when cut shows a star-like figure in reflected light because of its crystalline structure

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