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Brief Description: Copper is a chemical element that is symbolized as Cu (Latin: Cuprum) and it has atomic number 29. It is a ductile metal with excellent electrical conductivity. It belongs to the category of Adventitious Elements. Adventitious copper has specific gravity 8.93 and hardness that ranges from 2.5 to 3.0. Copper is a metal of reddish colour with high thermal and electrical conductivity. Its colour is due to the reflection of red and orange light, while it absorbs other frequencies of the colour spectrum. Crystal system: cubic with rare crystals. It usually occurs in arborescent aggregates or amorphous grains. It is found with silver minerals in hydrothermal veins and in the oxidation zone of sulphurous deposits. Copper constitutes an essential nutrient in all higher plants and animals. In animals, it is found primarily in the blood circulation as coenzyme and in various pigments. Copper has had an important role in the history of humankind that has used this metal for over 10,000 years. During the Roman Empire, copper was mainly exported from Cyprus and for this reason the Romans called it Cyprium, namely ?metal of Cyprus?, which was changed into Cuprum later on. There are several copper alloys with important historical and contemporary uses. Brass is an alloy of copper and zinc. While the metal ?copper? usually refers to alloys of copper-pewter, it is a general term for any copper alloy, like copper-aluminium, copper-silicon and copper-manganese. Because of its high conductivity it is mainly used in the manufacturing industry of electricity cables and in various alloys. 
Bibliography: Ευρετήριο ορυκτών ΑΠΘ στην ιστοσελίδα http://www.geo.auth.gr/ Τσιραμπίδης Α. Ο ορυκτός πλούτος της Ελλάδας. Εκδόσεις Γιαχούδη Θεσσαλονίκη, 2005, σελ. 391. Από την ελεύθερη ηλεκτρονική εγκυκλοπαίδεια Βικιπαιδεία στην ιστοσελίδα http://en.wikipedia.org/