Mineral Shapes Under Microscopy (IMAGE) Michigan Technological University Caption Polished iron exposed to electrolyte solutions will degrade and form iron carbonate and calcium carbonate films when exposed to oxygen and a heterogeneous mixture of platelets. Credit Mikhail Trought, Perrine group. Reprinted with permission from The Journal of Physical Chemistry A. Copyright 2021 American Chemical Society. Usage Restrictions MUST use image credit for copyright reasons. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.