Know all about Siltstone and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Comendite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Comendite is Porphyritic. Siltstone appears Rough and Comendite appears Foliated. The luster of Siltstone and Comendite is dull. Siltstone is available in brown, red, reddish brown colors whereas Comendite is available in blue, bluish - grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Comendite are cemetery markers.