Know all about Greywacke and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Rhyolite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Greywacke appears Dull and Rhyolite appears Banded. The luster of Greywacke is dull while that of Rhyolite is earthy. 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 Rhyolite is available in grey, white, light black colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Rhyolite are gemstone, laboratory bench tops, jewelry.