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Crystal chemistry of new descloizite-type compounds containing mercury

Matthias Weil
Crystal chemistry of new descloizite-type compounds containing mercury
European Journal of Mineralogy (December 2018) 31 (2): 369-378


Up to date the only mercury-containing phase with a descloizite-type of structure was synthetic HgZn(OH)[AsO (sub 4) ]. During phase formation studies under hydrothermal conditions, six new synthetic phases with composition HgM (super II) (OH)[AsO (sub 4) ] (M (super II) = Mg, Co, Ni, Cu) or HgM (super III) (O)[AsO (sub 4) ] (M (super III) = 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 nearly equal 7.8, b nearly equal 6.2, c nearly equal 8.6 Aa). 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 [MO (sub 6) ] octahedra, and, in case of the Mn- and Fe-members, to missing hydrogen bonding interactions. The replacement of OH (super -) by an O (super 2-) anion in the two HgM (super III) (O)[AsO (sub 4) ] (M (super III) = Mn, Fe) structures is unprecedented for descloizite-type phases and represent rare examples where an OH (super -) --> O (super 2-) substitution does not change the adopted structure family and/or the space-group type.

ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 31
Serial Issue: 2
Title: Crystal chemistry of new descloizite-type compounds containing mercury
Author(s): Weil, Matthias
Affiliation: Technische Universitaet Wien, Institute for Chemical Technologies and Analytics, Vienna, Austria
Pages: 369-378
Published: 20181214
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 38
Accession Number: 2019-003827
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201904
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