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  2  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Greenstone  \Green"stone`\  (gr[=e]n"st[=o]n`),  n.  [So  called  from 
  a  tinge  of  green  in  the  color.]  (Geol.) 
  A  name  formerly  applied  rather  loosely  to  certain 
  dark-colored  igneous  rocks,  including  diorite,  diabase,  etc 
  From  U.S.  Gazetteer  (1990)  [gazetteer]: 
  Greenstone,  PA 
  Zip  code(s):  17320