Know all about Coquina and Greywacke properties here. All properties of rocks are important as they define the type of rock and its application. Coquina and Greywacke belong to Sedimentary Rocks.Texture of Coquina is Clastic whereas that of Greywacke is Clastic. Coquina appears Layered, Banded, Veined and Shiny and Greywacke appears Dull. The luster of Coquina is dull to vitreous to submetallic while that of Greywacke is dull. Coquina is available in beige, buff, orange 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 Coquina are creating artwork and that of Greywacke are as armour rock for sea walls, petroleum reservoirs, sea defence, tombstones.