Know all about Siltstone and Arkose properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone and Arkose belong to Sedimentary Rocks.Texture of Siltstone is Clastic whereas that of Arkose is Clastic. Siltstone appears Rough and Arkose appears Rough and Dull. The luster of Siltstone and Arkose is dull. Siltstone and Arkose are available in brown, red, reddish brown colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Arkose are in aquifers, soil conditioner, source of magnesia (mgo), tombstones.