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The crystal structure of arangasite, Al2F(PO4)(SO4)·9H2O determined using low-temperature synchrotron data

Published online by Cambridge University Press:  05 July 2018

O. V. Yakubovich ,
I. M. Steele ,
V. V. Chernyshev ,
N. V. Zayakina ,
G. N. Gamyanin  and
O. V. Karimova
O. V. Yakubovich*
Affiliation:
Department of Geology, M.V. Lomonosov Moscow State University, Vorob’evy Gory, 119992 Moscow, Russia Institute of Geology of Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 117019 Moscow, Russia
I. M. Steele
Affiliation:
Department of Geophysical Science, University of Chicago, 5734 S. Ellis Avenue, Chicago, IL 60637, USA
V. V. Chernyshev
Affiliation:
Department of Chemistry, M.V. Lomonosov Moscow State University, Vorob’evy Gory, 119992 Moscow, Russia
N. V. Zayakina
Affiliation:
Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Science, Lenin Avenue 39, 677980 Yakutsk, Russia
G. N. Gamyanin
Affiliation:
Institute of Geology of Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 117019 Moscow, Russia
O. V. Karimova
Affiliation:
Institute of Geology of Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetny 35, 117019 Moscow, Russia
*
* E-mail: yakubol@geol.msu.ru
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Abstract

The crystal structure of the fibrous mineral arangasite, Al2F(PO4)(SO4)·9H2O from the Alyaskitovoje deposit, Eastern Yakutiya, Russia, was solved using low-temperature single-crystal data from synchrotron radiation and refined against F2 to R = 9.8%. Arangasite crystallizes in the monoclinic space group P2/a, with unit-cell parameters a = 7.073(1), b = 9.634(2), c = 10.827(2) Å, β = 100.40(1)°, V = 725.7(7) Å3 and Z = 2. The positions of all the independent H atoms were obtained by difference- Fourier techniques and refined in an isotropic approximation. The arangasite crystal structure is built from one-dimensional chains of Al octahedra and PO4 tetrahedra sharing vertices, quasi-isolated SO4 tetrahedra and H2O molecules. All O atoms are involved in the system of H bonding, acting as donors and/or acceptors. Hydrogen bonding serves as the only mechanism providing linkage between the main structural fragments, thus maintaining the framework. Chains of corner-sharing Al octahedra and P tetrahedra in the arangasite structure are topologically identical to the chains built from (Fe, Al) octahedra and P tetrahedra in the crystal structure of destinezite, Fe2(OH)(PO4)(SO4)·6H2O. It has been shown that in spite of very similar chemical formulae, arangasite and sanjuanite, Al2(OH)(PO4)(SO4)·9H2O, are not isotypic.

Keywords

phosphatesulfatearangasitecrystal structuresynchrotron radiationlow temperaturehydrogen bondsdestinezitesanjuanitefluellite
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 4 , August 2014 , pp. 889 - 903
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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