Az'urite, a crystallized copper carbonate, usually found in copper ores. It is found near Lyons, France, in Siberia and in Arizona. When occurring in large quantities and uncrystallized, it is used as a source of copper. Some varieties are cut into slabs and used for table tops, and others, especially those found in the mines of Arizona, are highly esteemed as gems. It is azure blue in color. It takes a high polish and presents a beautiful appearance.