Abstract
The crystal structure of fornacite Pb2(Cu,Fe)[CrO4(As,P)O4OH] from the Berezovskii deposit (Central Urals, Russia) was refined by X-ray powder diffraction data using the Rietveld method. Fornacite is monoclinic, space group P21/c, the unit cell dimensions are a = 8.09015(12), b = 5.90913(9), c = 17.4839(2) A, β = 109.99(2), V = 785.5(3) A3, and Z = 4. The structure was refined in the isotropic approximation of the atomic displacement parameters up to R p = 0.0516, R wp = 0.0692, R B = 0.0229, and R F = 0.0200. The fornacite structure is similar to that of minerals of the brackebuschite-group and consists of heteropolyhedral chains, built by the columns of edge-sharing Cu2+O6 octahedra connected with isolated Cr6+O4 and As5+O4 tetrahedra. The chains are linked by ninefold Pb2+ polyhedra.
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