Abstract
The crystal structure of a rare supergene mineral kuznetsovite Hg3(As04)Cl, previously determined from powder data, is refined (space group P213, a = 8.379(3) å, V = 588.3(4) å03, Z = 4, dcalc = 8.763 glcm3, 3.44 < θ < 24.96‡, 563 Ihkl(msd)/211 Ihkl(indep), R1 = 0.0997, wR2 = 0.2515). It is formed from the Cl− and (AsO4)3- anions (As-O 1.74(3) and 1.79(1) å) and the trigonal cations Hg 4+3 (Hg-Hg 2.675(5) å, HgHgHg 60‡). The coordination polyhedron around each mercury atom involves two mercury atoms, two oxygen atoms at short Hg-0 distances (2.17(3) and 2.28(3) å, < OHgO 94.3(13)‡), and more remote oxygen and chlorine atoms (Hg-0 2.601(6) å, Hg-Cl 2.838(9) å). The polyhedron is irregular and close to a trigonal antiprism. The Hg3 triangles alternate with AsO4 tetrahedra along each coordinate axis. Taking into consideration only short Hg-0 bonds (2.17(3) and 2.28(3) å), one can isolate a framework with chlorine ions lying in the cavities.
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Translated fromZhurnal Strukturnoi Khimii, Vol. 40, No. 2, pp. 324–330, March–April, 1999.
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Romanenko, G.V., Pervukhina, N.V., Borisov, S.V. et al. Crystal structure of kuznetsovite Hg3(AsO4)Cl. J Struct Chem 40, 270–275 (1999). https://doi.org/10.1007/BF02903656
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DOI: https://doi.org/10.1007/BF02903656