Laumontite

1 definition found

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

  Laumontite \Lau"mont*ite\, n. [From Dr. Laumont, the
     discoverer.] (Min.)
     A mineral, of a white color and vitreous luster. It is a
     hydrous silicate of alumina and lime. Exposed to the air, it
     loses water, becomes opaque, and crumbles. [Written also
     {laumonite}.]


     [1913 Webster]