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