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Hematite (iron ore) (weathered zone in the Biwabik Iron-Formation, Whiteside Mine, Buhl, Minnesota.jpg - Tillman
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 1 (21341020300).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 2 (21537764771).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 3 (21502830626).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 4 (20906271444).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 6 (21341173598).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 5 (21340975290).jpg - Ser Amantio di Nicolao
Specularite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) 7 (21537710581).jpg - Ser Amantio di Nicolao
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