scapolite

n. [ Gr. &unr_; a staff, or L. scapus a stem, stalk + -lite: cf. F. scapolite. ] (Mon.) A grayish white mineral occuring in tetragonal crystals and in cleavable masses. It is essentially a silicate of alumina and soda. [ 1913 Webster ]

☞ The scapolite group includes scapolite proper, or wernerite, also meionite, dipyre, etc. [ 1913 Webster ]