An excellent cabinet size specimen of small galena and sphalerite crystals, overgrowth by very lustrous pyrite crystals lately, in the process of oxidation, coated by bornite and covellite.
One amazing and very aesthetic cabinet size specimen of large pyrite cubs overgrowth by tetrahedral small sphalerite-marmatite crystals, followed by galena crystals, lately strongly dissolved to an amorph shape. Pyrite crystals were also under oxidation and are coated by bornite-covellite, which shows a beautiful rainbow effect.
An outstanding and extremely rare specimen of pseudomorph of pyrite after sphalerite and chalcopyrite, on quartz.. Giudurska mine, Erma reka, Zlatograd area, Bulgaria
An aesthetic cabinet sized specimen of large chalcopyrite crystals, singenetically developed with galena and sphalerite, followed by quartz. In the last stage of crystallization, oxidation creates a thin coating of bornite and covellite.