phonolite
/ˈfəʊnəlʌɪt
/noun [mass noun] Geology
A fine-grained volcanic igneous rock composed of alkali feldspars and nepheline.South of the city of Isparta pyroclastic rocks are interbedded with rhyolite, trachyte, phonolite and lamproite flows (the Golcuk and Bucak Volcanics of Savascin et al.)....
- In the Canaries, the lavas are much more compositionally varied in each of these stages, ranging from tholeiitic basalts to phonolites and trachytes.
- The dominant magma types are basalts and hawaiites, with lesser amounts of trachytes, quartz trachytes, alkali rhyolites and phonolites.
Origin
Early 19th century: from phono- 'relating to sound' (because of its resonance when struck) + -ite1.
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