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Named after the discoverer François Pierre Nicholas Gillet de Laumont (1747–1834) as lomonite, renamed as laumonite in 1809 and as laumontite in 1821. + -ite
Etymology from Wiktionary, CC BY-SA 4.0.
laumontite
Today it means: A mineral, of a white color and vitreous luster, with the chemical formula CaAl₂Si₄O₁₂·4H₂O. It is a hydrous silicate of alumina and lime. Exposed to the air, it loses water, becomes opaque, and crumbles. Full definition →