noun Petrography.

a fine-grained, dark rock of volcanic origin, essentially a basalt containing nepheline but no feldspar and little or no olivine.

Origin of nephelinite

First recorded in 1860–65; nepheline + -ite1
Related formsneph·e·li·nit·ic [nef-uh-luh-nit-ik] /ˌnɛf ə ləˈnɪt ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for nephelinite

Historical Examples of nephelinite

British Dictionary definitions for nephelinite



a fine-grained basic laval rock consisting of pyroxene and nepheline
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012