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Interbedded specularite-quartzite (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; display piece in monument at Tower Train Museum, Tower, Minnesota, USA) (21341238058).jpg - Ser Amantio di Nicolao
Quartzite (Precambrian; Rock Creek Canyon, Beartooth Mountains, Montana, USA) 3.jpg - Ser Amantio di Nicolao
Quartzite (Precambrian; Rock Creek Canyon, Beartooth Mountains, Montana, USA) 6.jpg - Ser Amantio di Nicolao
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