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