Know all about Rhyodacite and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Rhyodacite belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Rhyodacite is Earthy whereas that of Greywacke is Clastic. Rhyodacite appears Skeletal and Greywacke appears Dull. The luster of Rhyodacite is greasy to dull while that of Greywacke is dull. Rhyodacite is available in black to grey, dark greenish - 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 Rhyodacite are cemetery markers, creating artwork and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.