mineral is not always a rock. On the other hand, gold and silver, found pure or in the 'native' state...of a single chemical element, such as sulphur or gold, but more often it consists of a chemical compound...that of food supplies. Copper and gold were the first known metals. Gold occurs openly in nature. Its color...found and smelted. Remains of Bronze Age copper mines can be found, for instance, in various parts of...artificial compounds could be expressed as form11/as. Gold (Au), carbon (C), rock salt (NaCl), pyrite (FeS |