Know all about Siltstone and Charnockite properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Charnockite belongs to Igneous Rocks.Texture of Siltstone is Clastic whereas that of Charnockite is Granular. Siltstone appears Rough and Charnockite appears Veined or Pebbled. The luster of Siltstone is dull while that of Charnockite is not available. Siltstone is available in brown, red, reddish brown colors whereas Charnockite 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 Charnockite are curling, gemstone, laboratory bench tops, tombstones.