HARMOTOME

Etymology

Noun

harmotome (countable and uncountable, plural harmotomes)

(mineral) A rare zeolite, a hydrated barium silicate that forms vitreous white monoclinic crystals.

Source: Wiktionary

Har"mo*tome, n. Etym: [Gr. harmotome.] (Min.)

Definition: A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone.

Note: A related mineral, called lime harmotome, and Phillipsite, contains lime in place of baryta. Dana.

Source: Webster’s Unabridged Dictionary 1913 Edition