Heulandite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.


     [1913 Webster]

From WordNet (r) 2.0 [wn]:

  heulandite
       n : a group of minerals of the zeolite family consisting of a
           hydrous aluminum silicate of sodium and calcium