Formalin of boron silicate and other elements such as potassium, sodium, aluminum, iron, lithium, magnesium consists (BO3) 3 (Si, Al, B) 6O18 (OH, F) 4
). The color is
determined by the type of impurities Tourmaline covers a wide spectrum of colors of black, brown, red, yellow, blue and others.
Coral is one of the types of plants that grow in the rocky bottoms of some of the sea but Gsouna fossilized with red color is mostly dark. Coral consists of membership contain large amounts of calcium carbonate material and grow this article in the form of a red color spicules minutes secreted by coral plant. The main colors ranging from white coral color, pink, dark red, a color often.
