phonolite noun. ['fǝʊnǝlʌɪt] E19.
[from PHONO- + -LITE, with allus. to its resonance when struck with a hammer.]
Geology. Any of a group of extrusive igneous rocks composed of alkali feldspars and nepheline or other feldspathoid.

■ phonolitic [-'lɪtɪk] adjective pertaining to or consisting of phonolite M19.

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