La fonolita es una rara roca ígnea volcánica (extrusiva) de composición intermedia (entre félsicos y máficos), con texturas entre afaníticas y porfídicas. El nombre "fonolita" proviene del griego y significa "piedra sonora" por el sonido metálico que produce si golpea una placa no fracturada.

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Phonolite is an uncommon extrusive igneous rock, volcanic rock, of intermediate chemical composition between felsic and mafic, with texture ranging from aphanitic (fine-grain) to porphyritic (mixed fine- and coarse-grain). The name phonolite comes from the Ancient Greek meaning "sounding stone" because of the metallic sound it produces if an unfractured plate is hit; hence the English name clinkstone.

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