Know all about Greywacke and Suevite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Suevite belongs to Metamorphic Rocks.Texture of Greywacke is Clastic whereas that of Suevite is Earthy. Greywacke appears Dull and Suevite appears Banded. The luster of Greywacke is dull while that of Suevite is earthy. Greywacke and Suevite 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 Suevite are as a feed additive for livestock, gemstone, metallurgical flux, source of magnesia (mgo).