Platy hematite in association with banded iron. Banded iron is the result of microbial action in geothermal vents.
Location found: Negaunee Iron Formation, Old Republic Mine, Republic, MI, USA
Age: Precambrian - early Proterozoic; 2.0 - 2.2 billion years old
Size: approx. 1.5" W X 2.0"L X 0.5" D
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