What is another word for Phonolite?
Pronunciation: [fˈɒnəlˌa͡ɪt] (IPA) 
Phonolite is a volcanic rock that has a fine-grained texture and contains significant amounts of alkali feldspar minerals. There are several synonyms used to refer to this rock type, including foidolite, phonolitoid, and trachyphonolite. Foidolite is a term used for rocks that contain a high percentage of feldspathoid minerals. Phonolitoid is an altered variety of phonolite that has undergone some degree of chemical weathering or metamorphism. Trachyphonolite is a similar volcanic rock with a coarser texture and higher content of pyroxene minerals. All of these rocks share similar physical and chemical characteristics, but may vary in their mineral composition and texture.
