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English Dictionary: heulandite by the DICT Development Group
2 results for heulandite
From WordNet (r) 3.0 (2006) [wn]:
  1. a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium
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.
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