Related formspho·no·lit·ic [fohn-l-it-ik] /ˌfoʊn lˈɪt ɪk/, adjective
Examples from the Web for phonolite
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
The Wolf Rock is composed of phonolite, and it occurs largely in Auvergne.
The rock is phonolite, and is divided into irregular columns.A Naturalist's Voyage Round the World|Charles Darwin
(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.