A classic specimen of Chalcopyrite from the Corubian Orefield. Abundantly inter grown crystal specimen of Chalcopyrite with tarnished metallic brassy colour, crystals measuring to approximately 1.8cm. A later deposition of needle-like Quartz crystal druse mostly covers one edge of the specimen, with a dusting of biscuit coloured clay mineral on the Quartz. There is some apparent damage which is reflected in the price.