Know all about Gneiss and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Gneiss belongs to Metamorphic Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Gneiss is Banded, Foliated, Platy whereas that of Greywacke is Clastic. Gneiss appears Foliated and Greywacke appears Dull. The luster of Gneiss and Greywacke is dull. Gneiss is available in black, brown, 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 Gneiss are cemetery markers, jewelry, tombstones, used in aquariums and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.