Har"mo*tome (-m&osl;*tōm), n. [Gr. "armo`s a joint + te`mnein to cut: cf. F. harmotome.] (Min.) A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross- stone.

&fist; A related mineral, called lime harmotome, and Phillipsite, contains lime in place of baryta. Dana.