Phonolite
Pronunciation : Pho"no*lite
Part of Speech : n.
Etymology : [Phono- + -lite: cf. F. phonolithe.] (Min.)
Definition : Defn: A compact, feldspathic, igneous rock containing nephelite, ha?ynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone.
Source : Webster's Unabridged Dictionary, 1913