Know all about Argillite and Pyrolite properties here. All properties of rocks are important as they define the type of rock and its application. Argillite belongs to Sedimentary Rocks while Pyrolite belongs to Igneous Rocks.Texture of Argillite is Clastic, Polished whereas that of Pyrolite is Phaneritic. Argillite appears Rough and Dull and Pyrolite appears Rough and Shiny. The luster of Argillite is waxy and dull while that of Pyrolite is shiny. Argillite is available in dark grey to black, pink, red, white colors whereas Pyrolite is available in dark greenish - grey colors. The commercial uses of Argillite are fire resistant, used to manufracture paperweights and bookends and that of Pyrolite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.