Know all about Greywacke and Trachyandesite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Trachyandesite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Trachyandesite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Greywacke appears Dull and Trachyandesite appears Dull and Soft. The luster of Greywacke is dull while that of Trachyandesite is earthy. Greywacke and Trachyandesite 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 Trachyandesite are creating artwork, pottery.