Know all about Siltstone and Granite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Granite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Granite is Granular, Phaneritic. Siltstone appears Rough and Granite appears Veined or Pebbled. The luster of Siltstone is dull while that of Granite is dull to grainy with sporadic parts pearly and vitreous. Siltstone is available in brown, red, reddish brown colors whereas Granite 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 Granite are curling, gemstone, laboratory bench tops, tombstones, used in aquariums.