KS8011 Calcite (1/2 unit cell)
Overview
This structure is derived from the NaCl structure by replacing Na with Ca and Cl with CO3 radical so that the plane of the O3 is at right angles to the cube diagonal. As a result, more space is taken up in directions at right angles to the diagonal, this causing a dilation, and the cube is distorted into a rhombohedra. Other similar structures are CaCO3, MgCO3, FeO3, and NaNO3.
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