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