The morphology of whitherite and strontianite grown in silica gel, by slow precipitation and on hydrothermal conditions

Both the gel method, slow precipitation, hydrogen carbonate transport at room temperature as well as hydrothermal transport in a carbon dioxide solution and the hydrothermal decomposition of the oxalates were used to grow BaCO3 and SrCO3. The morphology of the resulting crystals is described and compared with respect to theoretical considerations including the Donnay-Harker rule and the PBC theory. (author)