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