Know all about Siltstone and Pyrolite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Pyrolite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Pyrolite is Phaneritic. Siltstone appears Rough and Pyrolite appears Rough and Shiny. The luster of Siltstone is dull while that of Pyrolite is shiny. Siltstone is available in brown, red, reddish brown colors whereas Pyrolite is available in dark greenish - grey colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Pyrolite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.