Know all about Greywacke and Porphyry properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Porphyry belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Porphyry is Porphyritic. Greywacke appears Dull and Porphyry appears Dull. The luster of Greywacke and Porphyry is dull. 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 Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors. The commercial uses of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Porphyry are creating artwork, gemstone, jewelry.