Know all about Greywacke and Essexite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Essexite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Essexite is Granular. Greywacke appears Dull and Essexite appears Banded. The luster of Greywacke is dull while that of Essexite is not available. 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 Essexite is available in dark grey to black colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Essexite are cemetery markers, commemorative tablets, jewelry, sea defence, tombstones.