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The crystal structure of kintoreite, PbFe3(PO4)2(OH,H2O)6

Published online by Cambridge University Press:  05 July 2018

Kharisu ,
M. R. Taylor ,
D. J. M. Bevan  and
A. Pring
Kharisu
Affiliation:
Department of Chemistry, Hinders University, GPO Box 2100 Adelaide, South Australia 5000, Australia
M. R. Taylor
Affiliation:
Department of Chemistry, Hinders University, GPO Box 2100 Adelaide, South Australia 5000, Australia
D. J. M. Bevan
Affiliation:
Department of Chemistry, Hinders University, GPO Box 2100 Adelaide, South Australia 5000, Australia
A. Pring
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
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Abstract

The crystal structure of kintoreite, PbFe3(PO4)2(OH,H2O)6, has been refined. The mineral is rhombohedral, Rm with a = 7.3310(7), c = 16.885(2) Å, Z = 3; the structure has been refined to R = 3.0% and Rw = 3.0% using 183 observed reflections [I > 2σ(I)]. Kintoreite has the alunite-type structure which consists of sheets of corner-sharing Fe(O,OH)6 octahedra parallel to (001). The sheets are composed of clusters of three corner-linked octahedra which are tilted so that the three apical O atoms form the base of the XO4 tetrahedra. The clusters of octahedra are linked to similar groups by corner-sharing to form six membered rings. The Pb cations occupy the cavities between pairs of octahedral sheets and are surrounded by six oxygen atoms from the tetrahedra and six oxygen atoms from the octahedra to form a very distorted icosahedron. The mean bond lengths for the various coordination polyhedra are X–O 1.55 Å, (X= P, As, S); Fe–(O, OH) 2.01 Å; Pb–O 2.84 Å. The composition of the crystal used in the refinement was PbFe3(PO4)1.3(AsO4)0.4(SO4)0.3(OH,H2O)6. The XO4 anions are disordered, as in beudantite, rather than being ordered, as they are claimed to be in corkite.

Keywords

kintoreitebeudantitecorkitecrystal structureKintore opencutNew South Wales
Type
Mineralogy
Information
Mineralogical Magazine , Volume 61 , Issue 404 , February 1997 , pp. 123 - 129
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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Footnotes

*

Permanent address: Fakultas Pertanian, Universitas Djenderal Soedirman, P.O. Box 25, Purwokerto 53101, Jawa-Tengah, Indonesia

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