Chrysocolla is a gemstone quality hydrous copper silicate, often forming with copper salts, iron and manganese oxides. Chrysocolla is most famous for its alluring, vivid blue to green cyan color, which is owed to the presence of copper impurities. Chrysocolla can be found in copper deposits all around the world. The most notable Chrysocolla sources include Israel, the Congo (Zaire), Chile, England, Kolwezi, Katanga (Shaba), Mexico, Peru, Russia, and the USA. Chrysocolla is 2 to 4 on the Mohs hardness scale.