phonolite
noun
pho·no·lite ˈfō-nə-ˌlīt 
: a gray or green volcanic rock consisting essentially of orthoclase and nepheline
Word History
Etymology
borrowed from French, from phono- phono- + -lite -lite, as loan translation of German Klingstein; so called from the metallic ringing sound it makes when struck
Note: The word was perhaps introduced by the French mineralogist Alexandre Brongniart (1770-1847), who used it in Traité élémentaire de minéralogie, tome premier (Paris, 1807), p. 353.
First Known Use
1831, in the meaning defined above