DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Limescale. This thick crust of limescale has been removed from the side of a water treatment reactor. It consists mostly of calcium carbonate (calcite) salt that precipitates out of water when it is heated. This sample measures 340 millimetres across.
Model release not required. Property release not required.