-ˌsīt noun
( -s )
Etymology: obsolete German leucit (now leuzit ), from leuc- + -it -ite
: a white or gray mineral KAlSi 2 O 6 consisting of a potassium aluminum silicate occurring in igneous rocks (as recent lavas) usually in trapezohedral crystals with a glassy fracture (hardness 5.5-6.0, specific gravity 2.45-2.50) — called also amphigene