“Two crystals of dark brown sphalerite, the major crystal in the center of the picture and the small one on the left side, both grown on a chalcopyrite crystal, tarnished to a copper-red color, on which some tiny spheres of malachite are grown. The crystal cluster is surrounded by orange siderite crystals. Collection and photo of Gianfranco Ciccolini.”

“Two crystals of dark brown sphalerite, the major crystal in the center of the picture and the small one on the left side, both grown on a chalcopyrite crystal, tarnished to a copper-red color, on which some tiny spheres of malachite are grown. The crystal cluster is surrounded by orange siderite crystals. Collection and photo of Gianfranco Ciccolini.”