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52.0 Banded iron formation. Minnesota. Gray-colored, aphanitic, iron-oxide-rich mineral layers interlayered with iron-rich red chert. [Scale shows cm divisions.]
Image 104 of 156
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![52.0 Banded iron formation. Minnesota. Gray-colored, aphanitic, iron-oxide-rich mineral layers interlayered with iron-rich red chert. [Scale shows cm divisions.]](../52.0.JPG)