Calcium carbonate is everywhere. From seashells to eggshells to antacid medicine, it is one of the most abundant minerals on our planet. But scientists still don’t agree on how it forms its many ...

To make concrete, limestone, or calcium carbonate, is mixed with clay and other materials and then calcined at high temperatures, so CO2 is released via the thermal decomposition of calcium carbonate.

SEM images of these crystals showed rhombohedral ... Vaterite, a less stable form of calcium carbonate, slowly transformed ...