Know all about Siltstone and Claystone properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone and Claystone belong to Sedimentary Rocks.Texture of Siltstone is Clastic whereas that of Claystone is Clastic. Siltstone appears Rough and Claystone appears Rough and Dull. The luster of Siltstone and Claystone is dull. Siltstone is available in brown, red, reddish brown colors whereas Claystone is available in black, blue, brown, green, grey, orange, red, white, yellow colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Claystone are pottery.