The crystal structure of the new mineral yedlinite has been determined using the Patterson method and refined to R = 0.14. The structure indicates the composition to be Pb6Cl6CrX6Y2 where X is O2− or OH, and Y is O2−, OH, or H2O. The structure contains a continuous three dimensional framework of irregular Pb(Cl5X2Y) polyhedra and CrX octahedra. Chromium seems to be in the 6+ valence state, and the structure of yedlinite appears to contain the first recognized occurrence of an octahedrally coordinated Cr6+ ion.

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