The crystal structure of nesquehonite, MgCO3.3H2O

Fig. 1. The crystal structure of K H C O 3 . M g C O 3 . 4 H 2 0 projected along the c axis; z coordinates are given in fractions multiplied by 1000. Probable hydrogen bonds are marked with dotted lines. polyhedron shares edges O(1)-O(1') with the K ions at 0,0,1 and 0,0,], and edges 0(2)-0(3) with Mg ions at 0,2,7 j1 and 0 , 1⁄2 , 1⁄2 . It links the carbonate groups in subsequent cells along the c axis through 0(4) in the cell below and 0(5) in the cell shown in the Figure. A list of calculated and observed structure factors is available upon request from the Laboratory for Crystallography of the University of Amsterdam, 126 Nieuwe Prinsengracht, Amsterdam C, Netherlands. Interatomic distances are given in Table 2.