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Phonolite
CIDE DICTIONARY
Phonolite, n. [Phono- + -lite: cf. F. phonolithe.].
A compact, feldspathic, igneous rock containing nephelite, haÜynite, etc. Thin slabs give a ringing sound when struck; -- called also clinkstone . [1913 Webster]
For further exploring for "Phonolite" in Webster Dictionary Online