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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.


(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


(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.
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References in periodicals archive ?
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.