Know all about Siltstone and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone and Gritstone belong to Sedimentary Rocks.Texture of Siltstone is Clastic whereas that of Gritstone is Earthy. Siltstone appears Rough and Gritstone appears Layered and Foliated. The luster of Siltstone and Gritstone is dull. Siltstone is available in brown, red, reddish brown colors whereas Gritstone is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Gritstone are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo), tombstones.