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