Tephriphonolite

Tephriphonolite or tephri-phonolite is a mafic to intermediate extrusive igneous rock in composition between phonotephrite and phonolite.^[1] It contains 9–14% alkali content and 48–57% silica content (see TAS diagram).^[2] Tephriphonolite is roughly equivalent to tephritic phonolite of the QAPF classification.^[3]

Tephriphonolite has been found, for example, at Colli Albani volcano in Italy^[4] and in the Asunción Rift of Paraguay.^[5]