Coin breccia

from The Collaborative International Dictionary of English v.0.48

Breccia \Brec"cia\, n. [It., breach, pebble, fragments of stone,
   fr. F. br[`e]che; of German origin. See {Breach}.] (Geol.)
   A rock composed of angular fragments either of the same
   mineral or of different minerals, etc., united by a cement,
   and commonly presenting a variety of colors.
   [1913 Webster]

   {Bone breccia}, a breccia containing bones, usually
      fragmentary.

   {Coin breccia}, a breccia containing coins.
      [1913 Webster]