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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Heulandite  \Heu"land*ite\,  n.  [After  Heuland,  an  English 
  mineralogist.]  (Min.) 
  A  mineral  of  the  Zeolite  family,  often  occurring  in 
  amygdaloid,  in  foliated  masses,  and  also  in  monoclinic 
  crystals  with  pearly  luster  on  the  cleavage  face.  It  is  a 
  hydrous  silicate  of  alumina  and  lime.