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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Castor  \Cas"tor\,  Castorite  \Cas"tor*ite\,  n.  [The  minerals 
  castor  and  pollux  were  so  named  because  found  together  on  the 
  island  of  Elba.  See  {Castor  and  Pollux}.]  (Min.) 
  A  variety  of  the  mineral  called  petalite,  from  Elba.