Word Study
laumontite
CIDE DICTIONARY
laumontite, n. [From Dr. Laumont, the discoverer.].
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. [1913 Webster]
For further exploring for "laumontite" in Webster Dictionary Online