Know all about Scoria and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Scoria belongs to Igneous Rocks while Greywacke belongs to Sedimentary Rocks.Texture of Scoria is Vesicular whereas that of Greywacke is Clastic. Scoria appears Glassy and Vesicular and Greywacke appears Dull. The luster of Scoria is subvitreous to dull while that of Greywacke is dull. Scoria is available in black, brown, dark grey to black, red 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 Scoria are as a traction material on snow-covered roads, creating artwork, high-temperature insulation, in gas barbecue grills and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.