Know all about Coquina and Argillite properties here. All properties of rocks are important as they define the type of rock and its application. Coquina and Argillite belong to Sedimentary Rocks.Texture of Coquina is Clastic whereas that of Argillite is Clastic, Polished. Coquina appears Layered, Banded, Veined and Shiny and Argillite appears Rough and Dull. The luster of Coquina is dull to vitreous to submetallic while that of Argillite is waxy and dull. Coquina is available in beige, buff, orange colors whereas Argillite is available in dark grey to black, pink, red, white colors. The commercial uses of Coquina are creating artwork and that of Argillite are fire resistant, used to manufracture paperweights and bookends.