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