Know all about Slate and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Slate belongs to Metamorphic Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Slate is Foliated whereas that of Greywacke is Clastic. Slate appears Dull and Greywacke appears Dull. The luster of Slate and Greywacke is dull. Slate is available in black, brown, buff, green, light to dark grey, purple, red, shades of blue 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 Slate are blackboards, commemorative tablets, laboratory bench tops, standard material for the bed of billiard table, standard material for the beds of pool and snooker table, tombstones, used in aquariums, writing slates and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.