Know all about Variolite and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Variolite belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Greywacke is Clastic. Variolite appears Dull and Soft and Greywacke appears Dull. The luster of Variolite is not available while that of Greywacke is dull. Variolite is available in black, brown, light to dark grey colors whereas Greywacke is 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 Variolite are cemetery markers, creating artwork and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.