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