#conductor.material  a substance that readily conducts e.g. electricity and heat
  exclusion:  #insulator
  supertype:  #material.substance__stuff  the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
  subtype:  #Cu__copper__atomic_number_29  a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor
     subtype:  #blister_copper__blistercopper  an impure form of copper having a black blistered surface
  subtype:  #Ag__silver__atomic_number_47  a soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography
     subtype:  #coin_silver  a silver of the degree of purity established for making legal silver coins
  subtype:  #semiconductor  a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; it increases with temperature and in the presence of impurities
     subtype:  #germanium__Ge__atomic_number_32  a brittle gray crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite

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