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