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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Iolite  \I"o*lite\,  n.  [Gr.  ?  a  violet  +  -lite.]  (Min.) 
  A  silicate  of  alumina,  iron,  and  magnesia,  having  a  bright 
  blue  color  and  vitreous  luster;  cordierite.  It  is  remarkable 
  for  its  dichroism,  and  is  also  called  dichroite.