leucite

[ loo-sahyt ]

/ ˈlu saɪt /

a whitish or grayish mineral, potassium aluminum silicate, KAlSi2O6, found in alkali volcanic rocks.

Origin of leucite

From the German word Leukit, dating back to 1790–1800. See leuco-, -ite¹

leu·cit·ic

[loo-sit-ik] /luˈsɪt ɪk/, adjective pseu·do·leu·cite, noun

They are rich in leucite, but contain also some sanidine and often much nepheline with hauyne or nosean.

Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 |Various
In such cases the felspar crystals ought to retain the forms of leucite.

Volcanoes: Past and Present |Edward Hull
The former consist mainly of plagioclase, leucite and augite, while the latter contain olivine in addition.

Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 |Various
Crystals of leucite with microliths and cavities darkened by magnetite dust; also, containing crystals of magnetite.

Volcanoes: Past and Present |Edward Hull

When leucite or nepheline replaces plagioclase, the rock becomes a leucite-basalt, or nepheline-basalt.

Volcanoes: Past and Present |Edward Hull

leucite

/ (ˈluːsaɪt) /

a grey or white mineral consisting of potassium aluminium silicate: a source of potash for fertilizers and of aluminium. Formula: KAlSi 2 O 6

leucitic (luːˈsɪtɪk), adjective