#inorganic_compound__inorganiccompound  any compound that does not contain carbon
  supertype:  #chemical_compound__compound  (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
  subtype:  #carbide  a binary compound of carbon with a more electropositive element
     subtype:  #calcium_carbide  a gray salt of calcium (CaC) used in making acetylene
     subtype:  #silicon_carbide__siliconcarbide  an extremely hard blue-black crystalline compound (SiC) used as an abrasive and a heat refractory material; crystals of silicon carbide can be used as semiconductors

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