laumontite

[ loh-mon-tahyt ]
/ loʊˈmɒn taɪt /

noun

a white zeolite mineral, chiefly hydrated silicate of aluminum and calcium.

Origin of laumontite

1795–1805; named after F. P. N. G. de Laumont (1747–1834), French mineralogist who discovered it; see -ite1