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