Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Banded iron formation and Variolite. Texture of Banded iron formation is Banded, Trellis 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 Banded iron formation vs Variolite texture, color, appearance and maintenance in the next section.