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

1860–65; nepheline + -ite1

nephelinitic [nef-uh-luh-nit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nephelinite (ˈnɛfɪlɪˌnaɪt)
a fine-grained basic laval rock consisting of pyroxene and nepheline

Collins English Dictionary - Complete & Unabridged 10th Edition
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