Know all about Greywacke and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Argillite belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Argillite is Clastic, Polished. Greywacke appears Dull and Argillite appears Rough and Dull. The luster of Greywacke is dull while that of Argillite is waxy and dull. Greywacke is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Argillite are fire resistant, used to manufracture paperweights and bookends.