Up to date the only mercury-containing phase with a descloizite-type of structure was synthetic HgZn(OH)[AsO4]. During phase formation studies under hydrothermal conditions, six new synthetic phases with composition HgMII(OH)[AsO4] (MII = Mg, Co, Ni, Cu) or HgMIII(O)[AsO4] (MIII = Mn, Fe) could be obtained. All phases adopt the descloizite-type of structure, as revealed by crystal-structure analysis using single-crystal X-ray diffraction data (space group Pnma, Z = 4, a ≈ 7.8, b ≈ 6.2, c ≈ 8.6 Å). Whereas the crystal structures of the Mg-, Co- and Ni-members show a high degree of similarity with the known Zn-member, the crystal structures of the Cu-, Mn- and Fe-members show much higher displacements of atoms relative to the Zn-member. In case of the Cu-member and to a minor extent in the Mn-member, this is ascribed to Jahn-Teller distortions of the [MO6] octahedra, and, in case of the Mn- and Fe-members, to missing hydrogen bonding interactions. The replacement of OH− by an O2− anion in the two HgMIII(O)[AsO4] (MIII = Mn, Fe) structures is unprecedented for descloizite-type phases and represent rare examples where an OH− → O2− substitution does not change the adopted structure family and/or the space-group type.
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Research Article|
March 01, 2019
Crystal chemistry of new descloizite-type compounds containing mercury
Matthias Weil
1
Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, TU Wien
, Getreidemarkt 9/164-SC, 1060Vienna, Austria
Corresponding author, e-mail: matthias.weil@tuwien.ac.at
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Corresponding author, e-mail: matthias.weil@tuwien.ac.at
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
19 Jul 2018
Revision Received:
25 Sep 2018
Accepted:
26 Sep 2018
First Online:
14 Dec 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart’sche Verlagsbuchhandlung, 70176 Stuttgart, Germany
European Journal of Mineralogy (2019) 31 (2): 369–378.
Article history
Received:
19 Jul 2018
Revision Received:
25 Sep 2018
Accepted:
26 Sep 2018
First Online:
14 Dec 2018
Citation
Matthias Weil; Crystal chemistry of new descloizite-type compounds containing mercury. European Journal of Mineralogy 2019;; 31 (2): 369–378. doi: https://doi.org/10.1127/ejm/2019/0031-2820
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