Know all about Greywacke and Trachyte properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Trachyte belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Trachyte is Aphanitic to Porphyritic. Greywacke appears Dull and Trachyte appears Banded. The luster of Greywacke is dull while that of Trachyte is metallic. Greywacke is available in beige, black, brown, colourless, cream, dark brown, green, grey, light green, light to dark grey, pink, red, white, yellow colors whereas Trachyte is available in black, brown, dark greenish - grey, green, grey, light to dark grey, white colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Trachyte are cemetery markers, creating artwork.