A simple method to control the polymorphs of calcium carbonate in CO2-diffusion precipitation

Using glycine as an additive and choosing different solution heights in the vessel, we can control the precipitation of calcium carbonate crystals on glass-clips with their polymorphs to be calcite, vaterite or aragonite. Then we tried to establish the causalities between experiment conditions and polymorphs on the aspect of nucleation energies. Qualitative analysis showed approving interpretation of results of the experiments. Further discussion summarized three ways in which additives may control polymorphs in biomineralization.