Know all about Greywacke and Phonolite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Phonolite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Phonolite is Granular. Greywacke appears Dull and Phonolite appears Banded and Foilated. The luster of Greywacke is dull while that of Phonolite is greasy to dull. 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 Phonolite is available in brown, buff, cream, green, grey, pink, white colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Phonolite are cemetery markers, creating artwork.