Calcium carbonate
CaCO3J. Appl. Cryst. (2005), 37, 158–167
Wikipedia: Calcium carbonate
Calcium carbonate adopts a variety of structures, the most common of which is calcite, which is the structure shown on this page. Calcite makes up the majority of limestone and marble.
2x2x1 unit cells
3x3x1 unit cells
Calcium coordination environment
3.0 Å radius, coordinating atoms only
3.0 Å radius, complete coordinating ions
Carbonate coordination environment
1.3 Å radius
3.5 Å radius, complete coordinating ions
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