Know all about Siltstone and Granodiorite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Granodiorite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Granodiorite is Granular, Phaneritic. Siltstone appears Rough and Granodiorite appears Veined or Pebbled. The luster of Siltstone is dull while that of Granodiorite is grainy, pearly and vitreous. Siltstone is available in brown, red, reddish brown colors whereas Granodiorite is available in black, grey, orange, pink, white colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Granodiorite are curling, gemstone, laboratory bench tops, tombstones.