The crystal structure of kamchatkite, a new naturally occurring oxychloride sulphate of potassium and copper

The crystal structure of the new mineral kamchatkite, a=9.741(5), b=12.858(6), c=7.001(3)A, space group Pna2" Z = 4, has been determined through direct methods using 1430 intensities and refined to a final discrepancy index R = 0.055. It contains (S04) tetrahedra and Cu octahedra interconnected by oxygen atoms to form an electrostatically neutral three-dimensional arrangement of formula CU30[S04h which contains channels parallel to [001]. The channels are not empty but house KCl molecules.