Very good size specimen formed by an aggregate of ferberite crystals with parallel growths and of intense luster and black color. It is accompanied by various lenticular crystals of siderite, some of them very aesthetically arranged on the ferberite. To give an even more elegant touch to the piece, various hyaline quartz crystals, one of them predominantly, sprinkled with brilliant pyrite crystals. And on the back there is a very good size arsenopyrite crystal that supports the ferberite. The main crystal is: 4,6 x 3,0 x 1,4 cm. 1,81 x 1,18 x 0,55 inc.