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