Know all about Siltstone and Chert properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone and Chert belong to Sedimentary Rocks.Texture of Siltstone is Clastic whereas that of Chert is Banded, Rough. Siltstone appears Rough and Chert appears Glassy or Pearly. The luster of Siltstone is dull while that of Chert is waxy and dull. Siltstone is available in brown, red, reddish brown colors whereas Chert is available in black, brown, green, grey, red, white colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Chert are creating artwork, gemstone, in fire-starting tools, jewelry, to ignite fire, used in flintlock firearms.