Abstract
The crystal structure of CsMgCl3 has been determined by Weissenberg technique. The crystals are hexagonal, with two molecules per unit cell of dimensions: a = 7.26(2)Angstrom, c = 6.18(1)Angstrom. Cs, Mg and Cl atoms are located at the special positions 2(d), 2(a) and 6(h) respectively of the space group P6(3)/mmc. After several cycles of least square refinement the reliability factor R converged at 0.068. The structure is isomorphous with that of CsNiCl3.