Know all about Greywacke and Variolite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Variolite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular. Greywacke appears Dull and Variolite appears Dull and Soft. The luster of Greywacke is dull while that of Variolite is not available. Greywacke and Variolite 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 Variolite are cemetery markers, creating artwork.