- a fine-grained volcanic rock composed chiefly of alkali feldspar and nepheline, some varieties of which split into pieces that ring on being struck.
Origin of phonolite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for phonolite
The rock is phonolite, and is divided into irregular columns.A Naturalist's Voyage Round the World
The Wolf Rock is composed of phonolite, and it occurs largely in Auvergne.
(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.
At last we draw ourselves up a huge wedge of phonolite and find ourselves at the summit of the first peak.The Columbia River
William Denison Lyman
- a fine-grained volcanic igneous rock consisting of alkaline feldspars and nepheline
C19: via French from German Phonolith; see phono-, -lite
Word Origin and History for phonolite
Online Etymology Dictionary, © 2010 Douglas Harper