Know all about Greywacke and Dunite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Dunite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Dunite is Phaneritic. Greywacke appears Dull and Dunite appears Rough and Shiny. The luster of Greywacke is dull while that of Dunite is shiny. 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 Dunite is available in dark greenish - grey colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Dunite are creating artwork, gemstone, jewelry, source of chromite, platinum, nickel and garnet, source of diamonds.