Chalcopyrite is a well known copper iron sulphide mineral and also a major copper ore, it has a brassy green colour and a metallic lustre, however, overtime, this lustre can dulls as oxidation takes place. This mineral, like many other ore minerals forms through volcanogenic processes often being deposited as sulfide ore deposits, as such it can often be found in ore veins, although it can form by other processes too. These particular specimens of chalcopyrite come from Scotland display this beautiful tarnished green colour, which is exaggerated by the presence of minute amounts caledonite, a sulphate-carbonate mineral closely associated with malachite and azurite. The turquoise copper stands out within the carbonate, and the chalcopyrite providing a golden sparkle. These specimens are available in 2 sizes - 2" x 2" and 3" x 2" and all come supplied with a white card tray and information label.