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The crystal structure of vlodavetsite, AlCa2(SO4)2F2Cl·4H2O

Published online by Cambridge University Press:  05 July 2018

G. L. Starova ,
S. K. Filatov ,
G. L. Matusevich  and
V. S. Fundamensky
G. L. Starova
Affiliation:
Department of Crystallography, State University, Univers. emb. 7/9, St. Petersburg, 199034, Russia
S. K. Filatov
Affiliation:
Department of Crystallography, State University, Univers. emb. 7/9, St. Petersburg, 199034, Russia
G. L. Matusevich
Affiliation:
Department of Crystallography, State University, Univers. emb. 7/9, St. Petersburg, 199034, Russia
V. S. Fundamensky
Affiliation:
NPP Burevestnik, St. Petersburg, Russia
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The crystal structure of vlodavetsite, AlCa2(SO4)2F2Cl·4H2O, has been determined, space group I4/m, a = 6.870(1), c = 13.342(2) Å, Z = 2, Dx = 2.35 g/cm3. The polyhedron cation chains are parallel to [001] and consist of couples of distorted Ca octahedra alternating with one distorted Al octahedron rotated through 24° with respect to the former. The chains are linked by SO4-tetrahedra so that all of the four tetrahedron oxygen atoms take part in coordination of Ca atoms to form a distorted octahedron with Cl and F atoms. The Al coordination polyhedron consists of two F atoms and four oxygen atoms belonging to water molecules. There is a specific interaction via hydrogen bonds between oxygen atoms of SO4-tetrahedra and water molecules.

Keywords

vlodavetsitecrystal structure
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 394 , March 1995 , pp. 159 - 162
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

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References

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