Calcite Crystals Forming (video) DOE/Pacific Northwest National Laboratory Loading video... Caption Diamond-shaped crystals of calcite form directly from solution. A round particle that could be either amorphous calcium carbonate or vaterite forms nearby. Credit Nielsen et al. 2014/Science Usage Restrictions Credit Nielsen et al. 2014/Science 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.