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