Quartz with sphalerite and Chalcopyrite

Old mineral specimen from Giudurska mine,Madan, Rhodopes mountaine, Bulgaria. It is presented by double terminated transparent quartz crystals, overgrought by chalcopyrite crystals, fallowed by large black sphaleryte crystal. Chalcopyrite crystals are object of oxidation, starting from a cracks and spots on the crystal faces, and coating surface in pink and blue by bornite and covelite spots.