What is nephelinite in geology ?

Nephelinite : definition

Nephelinite is an exceptional volcanic rock, leucocratic to mesocratic, composed mainly of nepheline, with a little titaniferous augite and other feldspathoids (sodalite, leucite, noséane or hauyne), melilite, and very exceptionally olivine . It occurs in blocks in other lavas and in some volcanic vents.
Streckeisen diagrams (or QAPF diagrams) - Classification of plutonic and volcanic rocks

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