Tephriphonolite is a mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite.[1] It contains 9 to 14% alkali content and 48 to 57% silica content (see TAS diagram).[2]


  1. "Unusual Lava Types". Strongly Alkaline Lavas. San Diego State University. Retrieved 2016-09-11.
  2. Bailey, Roy A. (2004). "Eruptive History and Chemical Evolution of the Precaldera and Postcaldera Basalt-Dacite Sequences, Long Valley, California: Implications for Magma Sources, Current Seismic Unrest, and Future Volcanism". United States Geological Survey: 17.
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