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