The chemical symbol for copper is CU which is derived from the Latin name for copper, CUPRUM. Found in its pure form, it is called native copper. Its melting point is 1084°. Copper can form in arborescent crystals and has a characteristic colour on the surface. Blue azurite and green malachite mineral can be found in copper deposits. The average quantity of copper in the earth’s crust is around 55 grams per metric ton. Copper is one of the best heat and electricity conductors after silver. Like gold, copper is the only metallic element with a natural colour and can be combined with nickel, zinc or aluminium to make alloys. Copper has excellent resistance to corrosion. Copper is essential to life, and occurs in all known living organisms including humans and other animals. The fungicidal and bactericidal activity of copper is used in agricultural production. In litho-therapy copper stimulates the flow of energy. A wonderful conductor, copper relieves rheumatism and in tellurism balances energy fields. In the United Kingdom the 7th wedding anniversary is called the Copper Anniversary, in France it is the 32nd. A journey from darkness into light, a bridge between the sacred and the profane, it carries the energy pattern of revelation in change. Its symbolic system is the representation of the four cardinal points of the universe.