A Crystal and Its Earliest Precursor (IMAGE) Max-Planck-Gesellschaft Caption Around 70 calcium and carbonate ions come together to form a stable nanocluster, shown here schematically and not to scale. The structure of the crystal (right) is most likely already determined in this cluster. Credit Denis Gebauer / Max Planck Institute of Colloids and Interfaces Usage Restrictions None License Licensed 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.