The Collaborative International Dictionary
Gismondite
Gismondine \Gis*mon"dine\, Gismondite \Gis*mon"dite\, n. [From the name of the discoverer, Gismondi.] (Min.) A native hydrated silicate of alumina, lime, and potash, first noticed near Rome.
Wiktionary
gismondite
n. (alternative form of gismondine English)