Know all about Nepheline Syenite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Nepheline Syenite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Nepheline Syenite is Granular whereas that of Siltstone is Clastic. Nepheline Syenite appears Banded and Foilated and Siltstone appears Rough. The luster of Nepheline Syenite is greasy to dull while that of Siltstone is dull. Nepheline Syenite is available in brown, buff, cream, green, grey, pink, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Nepheline Syenite are cemetery markers, creating artwork and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.