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