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