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