Laumontite
Pronunciation : Lau"mont*ite
Part of Speech : n.
Etymology : [From Dr. Laumont, the discoverer.] (Min.)
Definition : Defn: 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.]
Source : Webster's Unabridged Dictionary, 1913