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The crystal structure of elyite, Pb 4 Cu(SO 4 )O 2 (OH) 4 ·H 2 O, a = 14.233(2), b = 11.532(1), c = 14.611(2) Å, β = 100.45(1)°, V = 2358.4(5) Å 3 , Z = 8, was solved by direct methods and refined in space group P2 1 /c to R1 = 3.64% and wR2 = 5.10% for the 5861 independent reflections. Data were collected on a tiny untwinned crystal fragment with a four-circle diffractometer (MoKα radiation, CCD area detector). The structure contains eight unique Pb atoms, two isolated Cu atoms in planar fourfold-coordination (&lt;Cu-O&gt; = 1.933, 1.927 Å) and two isolated, almost ideal SO 4  tetrahedra. All anions coordinating Cu are OH groups. Two H 2 O molecules are weakly bound to Pb atoms. The Pb atoms show highly variable coordinations due to variable stereochemical activities of the Pb 2+  lone electron pairs. The connectivity of the structure is based on Pb-O polyhedra which are closely linked by common O ligands to form rod-like structure elements parallel to the b axis. The structure framework is held together by sharing ligands with CuO 4  squares and SO 4  tetrahedra. The CuO 4  squares can be considered as struts connecting the Pb-O rods along the c axis and, intermittently, along the a axis. A complex hydrogen bond system provides additional strengthening. The non-merohedral twinning parallel to {100} reported previously is explained by the presence of a pseudo-mirror plane in the structure. Comparisons are drawn with the structures of the related Pb-Cu-sulfates chenite, Pb 4 Cu(SO 4 ) 2 (OH) 6 , and linarite, PbCu(SO 4 )(OH) 2 . The violet color of elyite and other Cu compounds might be related to the planar fourfold-coordination of Cu.

Elyite, Pb 4 Cu(SO 4 )O 2 (OH) 4 ·H 2 O: Crystal structure and new data