Know all about Argillite and Hornfels properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Hornfels belongs to Metamorphic Rocks.Texture of Argillite is Clastic, Polished whereas that of Hornfels is Granular, Platy. Argillite appears Rough and Dull and Hornfels appears Dull. The luster of Argillite is waxy and dull while that of Hornfels is shiny. Argillite is available in dark grey to black, pink, red, white colors whereas Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Hornfels are cemetery markers, commemorative tablets, creating artwork.