nephelinite

[nef-uh-luh-nahyt]

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

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Examples from the Web for nephelinite

Historical Examples of nephelinite

They are chiefly leucite and nepheline rocks, such as leucitite, leucitophyre and nephelinite, but basalt and trachyte also occur.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2
Various

British Dictionary definitions for nephelinite

nephelinite

noun

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