Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Phonolite and Trondhjemite. Texture of Phonolite is Granular whereas that of Trondhjemite is Phaneritic. Based on the texture of rocks, they are used for various purposes. Get detailed information about Phonolite vs Trondhjemite texture, color, appearance and maintenance in the next section.