Source : Webster's Revised Unabridged Dictionary (1913)

Leucite \Leu"cite\ (l[=u]"s[imac]t), n. [Gr. leyko`s white: cf.
   F. leucite.]
   1. (Min.) A mineral having a glassy fracture, occurring in
      translucent trapezohedral crystals. It is a silicate of
      alumina and potash. It is found in the volcanic rocks of
      Italy, especially at Vesuvius.

   2. (Bot.) A leucoplast.