This rock was found in southern Africa's Greenstone Belt. The color of the rock definitely matches the formation name. What is special about this rock called butterstone dated to the geologic eon Archean. Thus the material is thought to be over 2.5 billion years old.
Bacteria and algae appeared at this time in the water. Volcanic activity produced increased atmospheric pressure and temperature. The higher temperature caused serpentization of the sediments thus the green color. In between the layers the micro stromatolites (like algal mats).
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