Wikimedi'Òc

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 1 (22263710708).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 4 (22264568259).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 2 (22425404226).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 6 (22263672278).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 5 (22425380866).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 7 (22462291361).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 9 (22462275161).jpg - Ser Amantio di Nicolao

Red quartz crystals lining void in specularite (Soudan Iron-Formation, Neoarchean, 2.722 Ga; Montana Stope, 27th level of the Soudan Mine, Soudan, Minnesota, USA) 8 (22451345235).jpg - Ser Amantio di Nicolao