The precipitated calcium carbonate was collected and analyzed qualitatively and quantitatively. The morphology of the CaCO3 was analyzed using the D2 Phaser X-ray Diffraction (XRD) from Bruker Corporation (Massachusetts, United States), the results of which are shown in Figure (left). The particle size of the precipitates was measured using Mastersizer 3000 Hydro HV from Malvern Panalytical. The mean size of the particles was around 0.74 µm (Figure , right). The experiment was repeated using a model solution, equimolar in concentrations of Ca and Mg 2+ as that of the Anhydrite solution, prepared using pure CaCl2.2H20 and MgCl2 from Carl Roth GmbH + Co. KG (Karlsruhe, Germany). The XRD analysis of the two samples in Figure (left) shows that for the extracted anhydrite solution, primarily the cubic structured, large Calcite crystals are precipitated with a small amount of hexagonal-shaped Vaterite. While the precipitation using the model solution in Figure (right) showed that smaller, metastable Vaterite crystals are precipitated almost completely, which, over time, changes to the more stable Calcite particles, as also been mentioned by Ngu et al., 2019 . This shows that the morphology of the precipitated CaCO3 is dictated by the presence of other impurities in the solution, as also mentioned in . The study to analyse and model this in more detail is in progress and will be presented in the future. In both cases, however, no MgCO3 could be precipitated due to the low concentration of Mg 2+ and higher solubility in the solutions.