Know all about Siltstone and Harzburgite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Harzburgite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Harzburgite is Phaneritic. Siltstone appears Rough and Harzburgite appears Rough and Shiny. The luster of Siltstone is dull while that of Harzburgite is shiny. Siltstone is available in brown, red, reddish brown colors whereas Harzburgite 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 Harzburgite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.