Know all about Greywacke and Tuff properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Tuff belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Tuff is Clastic, Pyroclastic. Greywacke appears Dull and Tuff appears Dull, Vesicular and Foilated. The luster of Greywacke is dull while that of Tuff is vitreous to dull. Greywacke and Tuff are 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 Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Tuff are creating artwork.