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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Euclase  \Eu"clase\n.  [Gr.  ?  well  easily  +  ?  to  break.  Cf  F. 
  euclase,  G.  euklas  See  named  from  its  brittleness.]  (Min.) 
  A  brittle  gem  occurring  in  light  green,  transparent  crystals, 
  affording  a  brilliant  clinodiagonal  cleavage.  It  is  a 
  silicate  of  alumina  and  glucina.