Know all about Greywacke and Benmoreite properties here. All properties of rocks are important as they define the type of rock and its application. Greywacke belongs to Sedimentary Rocks while Benmoreite belongs to Igneous Rocks.Texture of Greywacke is Clastic whereas that of Benmoreite is Glassy, Massive, Porphyritic, Scoriaceous, Trachytic, Vesicular. Greywacke appears Dull and Benmoreite appears Rough and Dull. The luster of Greywacke is dull while that of Benmoreite is earthy. Greywacke and Benmoreite are 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 Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones and that of Benmoreite are commemorative tablets, creating artwork, curling.