Characteristics related to grain size of rocks are called as texture. Here you can know more about texture of Gneiss and Oil shale. Texture of Gneiss is Banded, Foliated, Platy whereas that of Oil shale is Splintery. Based on the texture of rocks, they are used for various purposes. Get detailed information about Gneiss vs Oil shale texture, color, appearance and maintenance in the next section.