Know all about Greywacke and Gritstone properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke and Gritstone belong to Sedimentary Rocks.Texture of Greywacke is Clastic whereas that of Gritstone is Earthy. Greywacke appears Dull and Gritstone appears Layered and Foliated. The luster of Greywacke and Gritstone is dull. Greywacke and Gritstone 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 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.