<p style="text-align: center;"><a href="https://cdn.zmescience.com/wp-content/uploads/2012/05/calcite-hematite.jpg"><img class="aligncenter wp-image-12914" title="calcite-hematite" src="https://cdn.zmescience.com/wp-content/uploads/2012/05/calcite-hematite.jpg" alt="" width="500" height="630" /></a></p> <p style="text-align: center;"></p> <p style="text-align: left;">What you see here is calcite and hematite. <em>Calcite</em> is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3), while hematite is a mineral containing oxygen and iron (Fe2O3).</p>