Know all about Gritstone and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Gritstone and Greywacke belong to Sedimentary Rocks.Texture of Gritstone is Earthy whereas that of Greywacke is Clastic. Gritstone appears Layered and Foliated and Greywacke appears Dull. The luster of Gritstone and Greywacke is dull. Gritstone and Greywacke 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 Gritstone are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo), tombstones and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.