Know all about Siltstone and Pegmatite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Pegmatite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Pegmatite is Pegmatitic. Siltstone appears Rough and Pegmatite appears Layered, Banded, Veined and Shiny. The luster of Siltstone is dull while that of Pegmatite is grainy, pearly and vitreous. Siltstone is available in brown, red, reddish brown colors whereas Pegmatite is available in black, brown, cream, green, grey, pink, red, rust, silver, white, yellow colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Pegmatite are creating artwork, jewelry, source of corundum, tourmalines, beryls and topaz.