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