Know all about Greywacke and Andesite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Andesite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Andesite is Aphanitic to Porphyritic. Greywacke appears Dull and Andesite appears Dull and Soft. The luster of Greywacke is dull while that of Andesite is vitreous. 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 Andesite is available in bluish - grey, grey, pink, yellow colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Andesite are commemorative tablets, creating artwork.