Leucite lavas from which feldspar is absent are divided into the leucitites and leucite basalts.
2.
Bracciano and Roccamonfina are other Italian localities for leucitite, and in Java, Montana, Celebes and New South Wales similar rocks occur, The leucite basalts belong to more basic types and are rich in olivine and augite.
3.
It is characteristic of the later volcanic rocks rich in alkalis, such as phonolite, nepheline-basalt, leucite basalt, etc ., and also of certain plutonic rocks of the nepheline syenite series, which are typically developed in southern Norway.
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