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.

Source: Webster's Revised Unabridged Dictionary (1913)