Know all about Gneiss and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Argillite belongs to Sedimentary Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Argillite is Clastic, Polished. Gneiss appears Foliated and Argillite appears Rough and Dull. The luster of Gneiss is dull while that of Argillite is waxy and dull. Gneiss is available in black, brown, pink, red, white colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Argillite are fire resistant, used to manufracture paperweights and bookends.