Know all about Chalk and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Chalk and Greywacke belong to Sedimentary Rocks.Texture of Chalk is Clastic or Non-Clastic whereas that of Greywacke is Clastic. Chalk appears Soft and Greywacke appears Dull. The luster of Chalk and Greywacke is dull. Chalk is available in grey, white, 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 Chalk are alumina refineries, creating artwork, drawing on blackboards, gymnasts, athletes and mountain climbers use for grip, in aquifers, paper industry, production of lime, raw material for manufacture of quicklime, slaked lime, soil conditioner, whiting, whiting material in toothpaste, paint and paper and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.