Know all about Slate and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Slate is Foliated whereas that of Siltstone is Clastic. Slate appears Dull and Siltstone appears Rough. The luster of Slate and Siltstone is dull. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.