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