4″ Mary Ellen Jasper Sphere Fossil Stromatolite SPF1
This is a gorgeous sphere and an outstanding example of Mary Ellen Jasper. Mary Ellen Jasper occurs in the Banded Iron Formation in Minnesota. The material is also a fossil, called stromatolite which is a form of fossil algae.
The sphere has about 4″ diameter (101.6 mm) and it weighs about 3.1 lbs. Origin: Minnesota.
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The red color is due to the iron oxide that resulted from the oxidation of the iron in the formation. The oxygen for the oxidation supplied by cyanobacteria which produced the oxygen during their photosynthesis process. The oxidation occurred two or more billion years ago and affected the upper layer of the formation. The non-oxidized lower layers are green and black.