laumontite

noun
lau·​mont·​ite
variants: or less commonly laumonite or lomonite \lōˈmän(t‧)ˌīt \
plural -s

Definition of laumontite 

: a white monoclinic mineral CaAl2Si4O12.4H2O consisting of a hydrous calcium and aluminum silicate and having a vitreous luster that upon exposure to the air loses water, becomes opaque, and crumbles

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History and Etymology for laumontite

laumontite, laumonite alteration of lomonite, irregular from F. P. N. G. de Laumont †1834 French mineralogist + English -ite

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