Know all about Greywacke and Comendite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Comendite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Comendite is Porphyritic. Greywacke appears Dull and Comendite appears Foliated. The luster of Greywacke and Comendite is 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 Comendite is available in blue, bluish - grey colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Comendite are cemetery markers.