Know all about Greywacke and Itacolumite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Itacolumite belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Itacolumite is Clastic, Granular, Rough. Greywacke appears Dull and Itacolumite appears Rough. The luster of Greywacke and Itacolumite is dull. Greywacke and Itacolumite are 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 Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Itacolumite are an oil and gas reservoir, in aquifers, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones.