scapolite

from The Collaborative International Dictionary of English v.0.48

Scapolite \Scap"o*lite\ (sk[a^]p"[-o]*l[imac]t), n. [Gr. ? 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]

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