What you see here is calcite and hematite. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3), while hematite is a mineral containing oxygen and iron (Fe2O3).
GeoPicture of the day: calcite and hematite
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Published on Mon, May 21, 2012 by Mihai Andrei
Post filled in: GeoPicture