Definition of nephelinization in English:
nephelinization
(also nephelinisation)
noun ˌnɛf(ə)lɪnʌɪˈzeɪʃnˌnɛfəlɪnʌɪˈzeɪʃn
Geology The alteration of a rock to one in which nepheline is a significant constituent.
Origin
1940s; earliest use found in Science. From nepheline + -ization.