Know all about Shale and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Shale and Greywacke belong to Sedimentary Rocks.Texture of Shale is Clastic, Splintery whereas that of Greywacke is Clastic. Shale appears Muddy and Greywacke appears Dull. The luster of Shale and Greywacke is dull. Shale is available in black, brown, buff, green, grey, red, yellow 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 Shale are creating artwork, pottery and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.