Superb twinned Sphalerite decorated with Chalcopyrite pseudomorph from the famous Madan ore field, Bulgaria. Displays black Sphalerites crystals with strong luster, complex structure and marvelous twinning. The main 40 mm Sphalerite crystal forms a superb focal point. On strong backlight the crystals display some gemminess. On the back side are seen pseudomorphed Sphalerite crystals by yellow Chalcopyrite. In excellent condition – some small nicks.

First grade Sphalerite!