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Related to phonolitic: nephelinite, Tephrite, trachybasalt


A light-colored volcanic rock composed largely of feldspars.

pho′no·lit′ic (-lĭt′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) a fine-grained volcanic igneous rock consisting of alkaline feldspars and nepheline
[C19: via French from German Phonolith; see phono-, -lite]
phonolitic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈfoʊn lˌaɪt)

a fine-grained volcanic rock composed chiefly of alkali feldspar and nepheline.
[1820–30; < French < German Phonolith. See phono-, -lite]
pho`no•lit′ic (-ˈɪt ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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This analysis of Gran Canaria island distinguishes three distinct phytogeographic zones on the island: the North-East half is characterized by the influence of trade winds, geological youth and a basaltic substrate; the Southern quadrant, which is sheltered from the trade winds and Atlantic storms from the west, is of moderate geological age, representing the most xerophytic part of the island, dominated by acidic phonolitic substrates; and the Western quadrant, which is subject to the occasional influence of trade winds and is vulnerable to storms from the west, represents the oldest part of the island and is alternately dominated by highly altered phonolitic and basalt rocks.
Geologically, the Law is a volcanic plug, formed around 335 million years ago and composed of phonolitic trachyte.