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Crystal structure and physical properties of sophiite, Zn2(SeO3)Cl2, a new mineral

Published online by Cambridge University Press:  05 July 2018

T. F. Semenova ,
I. V. Rozhdestvenskaya ,
S. K. Filatov  and
L. P. Vergasova
T. F. Semenova
Affiliation:
Department of Crystallography, Leningrad State University, C.I.S.
I. V. Rozhdestvenskaya
Affiliation:
Department of Crystallography, Leningrad State University, C.I.S.
S. K. Filatov
Affiliation:
Department of Crystallography, Leningrad State University, C.I.S.
L. P. Vergasova
Affiliation:
Department of Crystallography, Leningrad State University, C.I.S.
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Abstract

The crystal structure of sophiite, Zn2(SeO3)Cl2 (a = 10.251(4), b = 15.223(2), c = 7.666(5) Å, Z = 8) was solved in space group Pccn from single crystal X-ray data, and refined to R = 0.053 for 666 Fo > 4oFo. The mineral belongs to layer compounds. The threefold coordinated Se atom is at the apex of a pyramid, the base of which is formed by three O atoms; Se-O = 1.69 Å. Zn cations occupy two positions with distorted tetrahedral and octahedral coordinations. In the tetrahedra, Zn cations are surrounded by two O (2.02 Å) and two Ci (2.224 Å) atoms. Zn octahedra contain four O atoms (2.07 Å) and two CI atoms (2.701 Å). The atomic arrangement is characterized by rings containing two Se pyramids linked by their corners to two Zn tetrahedra. The rings are linked by their edges and corners to Zn octahedra to form layers parallel to (010). The layers are interconnected by residual Van der Waals bonds.

Experimental results on thermal phase transformations and deformations, crystal optics and other physical properties of sophiite are presented. A structural aspect of their anisotropy is discussed.

Keywords

sophiitecrystal structureTolbachik volcanoKamchatka
Type
Crystal Structure
Information
Mineralogical Magazine , Volume 56 , Issue 383 , June 1992 , pp. 241 - 245
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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Footnotes

*

LNPO 'Burevestnik', Leningrad, C.I.S.

†

Institute of Volcanology, Academy of Sciences of the C.I.S., Petropavlovsk-Kamchatsky

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