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