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The crystal structure of namuwite, (Zn,Cu) 4 SO 4 (OH) 6  · 4H 2 O, trigonal, a = 8.331(6), c = 10.54(1) Å, V = 634(1) Å 3 , P3̅, Z= 2, has been solved by direct methods and refined to an R index of 7.9% using MoΚα X-ray data. The fundamental building unit of the structure is a gently modulated sheet of edge-sharing (Zn,Cu) octahedra parallel to (001), with one vacancy for every six occupied octahedral sites. The sheets are decorated on both sides by SO 4  and [Zn(OH) 3 (H 2 O)] 1-  tetrahedra; the latter are located above and below the vacant octahedral sites. Adjacent tetrahedral-octahedral-tetrahedral (T-O-T) layers are held together by hydrogen bonds to interstitial H 2 O molecules.

american mineralogist

The crystal structure of namuwite, a mineral with Zn in tetrahedral and octahedral coordination, and its relationship to the synthetic basic zinc sulfates