Pyrite
Gola del Furlo, Fossombrone, Pesaro and Urbino Province, Marche, Italy
Association, divergent, cubic crystals of pyrite, to form as a mosaic. On limestone. Only partially etched. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, Scheider Kreuznach Componon 135 mm; f: 5.6. Focal using 7.