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