Know all about Mudstone and Nepheline Syenite properties here. All properties of rocks are important as they define the type of rock and its application. Mudstone belongs to Sedimentary Rocks while Nepheline Syenite belongs to Igneous Rocks.Texture of Mudstone is Clastic whereas that of Nepheline Syenite is Granular. Mudstone appears Rough and Dull and Nepheline Syenite appears Banded and Foilated. The luster of Mudstone is dull while that of Nepheline Syenite is greasy to dull. Mudstone is available in black, blue, brown, green, grey, orange, red, white, yellow colors whereas Nepheline Syenite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Mudstone are creating artwork, pottery and that of Nepheline Syenite are cemetery markers, creating artwork.