Know all about Diorite and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Diorite belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Diorite is Phaneritic whereas that of Siltstone is Clastic. Diorite appears Shiny and Siltstone appears Rough. The luster of Diorite is shiny while that of Siltstone is dull. Diorite is available in black, brown, light to dark grey, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Diorite are creating artwork, curling and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.