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Crystal structure of a new mineral lahnsteinite Zn4(SO4)(OH)6 · 3H2O

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Abstract

A sample of a new mineral from the oxidation zone of the hydrothermal Pb, Zn, Ag Friedrichssegen deposit (Rhineland-Palatinate, Germany) was studied by single-crystal X-ray diffraction. The parameters of the triclinic (pseudoorthorhombic) unit cell are found to be a = 8.312(1) Å, b = 14.545(1) Å, c = 18.504(2) Å, α = 89.71 (1)°, β = 90.05(1)°, γ = 90.13(1)°, and V = 2237.3(3) Å3. The structure is solved by direct methods into the sp. gr. P1 and refined to an R factor of 10.7% using 3788 reflections with |F| > 3σ(F) in the isotropic-anisotropic approximation. The crystallochemical formula of lahnsteinite (Z = 8) is [(Zn2.6Fe0.3Cu0.1)VI(OH)3][ZnIV(OH)3(H2O)][SO4] · 2H2O, where the compositions of the layer composed of Zn octahedra and isolated Zn and S tetrahedra are given in square brackets. The mineral under study is chemically and structurally similar to namuwite and is a natural analog of synthetic zinc hydroxide sulfate trihydrate.

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Correspondence to R. K. Rastsvetaeva.

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Original Russian Text © R.K. Rastsvetaeva, S.M. Aksenov, N.V. Chukanov, I.A. Verin, 2012, published in Kristallografiya, 2012, Vol. 57, No. 5, pp. 820–824.

On the 100th anniversary of the discovery of X-ray diffraction

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Rastsvetaeva, R.K., Aksenov, S.M., Chukanov, N.V. et al. Crystal structure of a new mineral lahnsteinite Zn4(SO4)(OH)6 · 3H2O. Crystallogr. Rep. 57, 737–741 (2012). https://doi.org/10.1134/S1063774512050148

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  • DOI: https://doi.org/10.1134/S1063774512050148

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