bell metal ore

from The Collaborative International Dictionary of English v.0.48

Bell metal \Bell" met`al\
   A hard alloy or bronze, consisting usually of about three
   parts of copper to one of tin; -- used for making bells.
   [1913 Webster]

   {Bell metal ore}, a sulphide of tin, copper, and iron; the
      mineral stannite.
      [1913 Webster]