Know all about Greywacke and Ijolite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Ijolite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Ijolite is Earthy, Granular. Greywacke appears Dull and Ijolite appears Banded and Foilated. The luster of Greywacke is dull while that of Ijolite 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 Ijolite 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 Ijolite are cemetery markers, creating artwork.