Know all about Siltstone and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Siltstone belongs to Sedimentary Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Siltstone is Clastic whereas that of Hornfels is Granular, Platy. Siltstone appears Rough and Hornfels appears Dull. The luster of Siltstone is dull while that of Hornfels is shiny. Siltstone is available in brown, red, reddish brown colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. The commercial uses of Siltstone are raw material for the manufacture of mortar, soil conditioner and that of Hornfels are cemetery markers, commemorative tablets, creating artwork.