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Brief Description: The mineral?s name derives from the Greek terms ?chrysos? (gold) and ?colla? (glue), referring to a material that serves in gold welding. It was used by Theophrastus in 315 B.C. for the first time. Chrysocolla (hydrated copper silicate) is an ore with chemical formula Cu4H4Si4O10(OH)8 and it belongs to the Phylosilicates category. It is of secondary origin and forms in the oxidization zones of copper deposits. It has vitreous or waxy lustre, attractive blue-green colour and it is opaque to transparent. Its specific gravity is 2.0 ? 2.3 and its hardness ranges from 2.5 to 3.5. It occurs in glassy botryose or rounded masses and crusts or veins. Because of its colour, it is sometimes confused with another mineral, Turquoise (which belongs to the phosphate). It is used as an ornamental stone. 
Bibliography: Ευρετήριο ορυκτών ΑΠΘ στην ιστοσελίδα http://www.geo.auth.gr/106/az_gr.htm Από την ιστοσελίδα http://mineral.galleries.com/minerals/ Τσιραμπίδης Α. (2005). Ο ορυκτός πλούτος της Ελλάδας. Εκδόσεις Γιαχούδη Θεσσαλονίκη, σελ. 391. Berry, L.G., Mason, B. and Dietrich, R.V. (1983). Mineralogy. W. H. Freeman and Company, San Francisco, 561 pp.