Dark or brassy in color, often with an iridescent film coating. Only silver is a better electrical conductor than copper. Bronze, which is made by combining copper and tin, was used by the ancient Egyptians and Romans. Both of these metals are stronger than pure copper. Coins, cooking utensils, copper pipe, sterling silver, ammunition, and blue pigments all contain copper.
Copper is necessary for the formation of hemoglobin.
It also keeps bones, blood vessels, and nerves healthy. Microscopic gold is found in many different rock types in Nevada gold mines, including jasperoid, a dense, hard rock formed by the replacement of calcite or dolomite with microcrystalline silica or chalcedony. In place of a discussion on jasperoid, the focus will be directed toward the presence and uses of gold. Much of the American West was explored and settled because of man's search for gold. Gold is a malleable and ductile metallic element which combines with few other elements so it never tarnishes, stains, rusts, or corrodes.