Coral - ancient organisms, which was formed in the era of the Paleozoic era, which means that its age exceeds a million years. Coral polyps are multicellular invertebrates forming horny and calcareous skeletons of different colors and sizes, composed of aragonite and calcite. Can not be called dead coral mineral, because it is constantly growing. For a good growth and the existence of this organism requires special conditions that exist in some areas of the ocean: the water should be warm and very clean, cold currents and high salt content.
The most valuable species of corals painted in red, pink and orange. They were used in Ancient Greece for making amulets, symbolizing immortality and happiness, as well as aversive illness and misfortune. Color Coral totally dependent on the amount and composition of organic compounds. They come in red, white, pink, blue and even black.