Archaean Banded Iron Stromatolites from Wisconsin

Name: Banded Iron Stromatolites (polished)

Age: Archaean (2.73 billion years old)

Size (25.4 mm = 1 inch): 5 by 5 inches

Location: Jackson County Iron Formation in Wisconsin

Code: DS428

Price: $45.00 - Sold


This banded iron is metasediment (sediment that has undergone metamorphism) and has a high content of magnetite (Fe3O4), a natural magnet, and yielding the midnight black coloration; minute crystalline forms of other mineral-based compounds are also present. Whether the sediment was of bioorganic origin (stromatolite) is indeterminable, but likely.

The specimen has been hand-polished to a glassine finish on one side with fine carbide and diamond abrasive, a very labor-intensive job. The picture comparing front and back reveals the value of this form of polishing.

Stone Relic Purchase Information

Click to enlarge


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