nephelinitic

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:
1860–65; nepheline + -ite1

nephelinitic [nef-uh-luh-nit-ik] , adjective
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World English Dictionary
nephelinite (ˈnɛfɪlɪˌnaɪt)
 
n
a fine-grained basic laval rock consisting of pyroxene and nepheline

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