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Mineral structures (one unit cell each) for aragonite (de Villiers, 1971), vaterite (Meyer, 1959), calcite (Graf, 1961), and sperocobaltite (Graf, 1961) accessed using the American Mineralogist Crystal Structure Database (http://rruff.geo.arizona.edu/AMS/amcsd.php), built in Vesta (Momma and Izumi, 2011), and refined in Cinema4D.
Graf, D. L., 1961. Crystallographic tables for the rhombohedral carbonates. American Mineralogist, 46: 1283-1316.
Meyer, H. J. 1959. Uber Vaterit und seine Struktur. Angewandte Chemie; 71: 678-679.
de Villiers, J. P. R., 1971. Crystal structures of aragonite, strontianite, and witherite. American Mineralogist 56: 758-767.
Momma, K., Izumi, F., 2011. VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data. Journal of Applied Crystallography, 44: 1272-1276.