Know all about Marl and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Marl and Greywacke belong to Sedimentary Rocks.Texture of Marl is Earthy whereas that of Greywacke is Clastic. Marl appears Rough and Dull and Greywacke appears Dull. The luster of Marl and Greywacke is dull. Marl is available in beige, brown, green, grey, 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 Marl are creating artwork, soil conditioner and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.