Rocks are naturally occurring solids which are composed of minerals & have been used by humans since ages. From Stone Age, rocks are used for various purposes. Also, the metals and minerals found in rock play an important role in our life. Get to know all the Coquina Uses. We have provided you with all information about Coquina rock here. Coquina is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically-sorted fragments of the shells of molluscs, trilobites, brachiopods, or other invertebrates. Coquina is available in beige, buff, orange colors. The streak of a rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Coquina is white. Get to know more about Coquina rock and characteristics of Coquina rock in the next sections.