The rock making up Devils Tower is classified as phonolite porphyry (Darton and O'Harra, 1907, p.
On the weathered surfaces the phonolite porphyry is a light gray or brownish gray.
It is composed of a crystalline rock, classified as phonolite porphyry, that when fresh is gray but which weathers to green or brown.
The Cerro de Flores is a hill covered with tabulary blocks of greenish grey phonolite, enclosing long crystals (not fendillated) of vitreous felspar, altogether analogous to the phonolite of Mittelgebirge.
Aenigmatite and its variety cossyrite are rare minerals forming constituents of igneous rocks of the nepheline-syenite and phonolite groups.
I found a mass of crystals of the greenish volcanic glass, called olivine, imbedded in a piece of phonolite which looked as blue and fresh as if only quarried yesterday.
Not far off is a cave, a lava-bubble, in which the natives used to live when they came up here to quarry a very hard adjacent phonolite for their axes and other tools.
They argue, from the amount of the chippings, that this mass of phonolite was quarried for ages by countless generations of men, and that the mountain top must have been upheaved, and the island inhabited, in a very remote past.
But as it is known that extraneous fragments of cellular rock are sometimes included in columnar trachyte, in phonolite (D'Aubuisson "Traite de Geognosie" tome 2 page 548.
Near the base of this hill, I observed beds of white tuff, intersected by numerous dikes, some of amygdaloidal basalt and others of trachyte; and beds of slaty phonolite with the planes of cleavage directed N.
It is the real porphyrschiefer of Werner; and it would be difficult to distinguish, in a collection of stones, the phonolite of Parapara from that of Bilin, in Bohemia.
This fact confirms the connection which we find, notwithstanding the difference of fracture and of specific gravity between the saussurite and the siliceous basis of the porphyrschiefer, which is the phonolite (klingstein).
The phonolite (or leucostine compacte of Cordier) is pretty generally regarded by all who have at once examined burning and extinguished volcanoes, as a flow of lithoid lava.
Phonolite is broken shale, a thin, sharp rock that gives forth a pleasant, metallic sound when struck, like shattered crockery.
When they came to Phonolite Pass, the last of the cut-offs on the trail, Van rode no more than a hundred yards into its shadows before he feared he must turn.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "phonolite" in a variety of sentences. We hope that you will now be able to make sentences using this word.
