Min. Earlier lomonite, laumonite. [Named (G. lomonit) by Werner, 1805, after Gillet de Laumont, its discoverer: see -ITE.] Hydrous silicate of aluminium and calcium, found in crystals which lose water when exposed to the air.
1805. Jameson, Syst. Min., II. 539. Lomonite.
1808. T. Allan, Alphab. List, 42. Laumonite.
1843. Portlock, Geol., 218. Laumonite has only been observed at Portrush, and is there very rare.
1868. Dana, Min. (ed. 5), 400. Laumontite occurs in the cavities of trap.
1894. Amer. Jrnl. Sci., Ser. III. XLVIII. 190. Laumontite … Loses about 1/2 its water at 300°.
