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

Kharisun, M. R. Taylor, D. J M Bevan, A. Pring

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    The crystal structure of kintoreite, PbFe3(PO4)2(OH,H2O)6, has been refined. The mineral is rhombohedral, R3m 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 cornerlinked 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.

    Original languageEnglish
    Pages (from-to)123-129
    Number of pages7
    JournalMineralogical Magazine
    Volume61
    Issue number404
    DOIs
    Publication statusPublished - 1 Feb 1997

    Keywords

    • Beudantite
    • Corkite
    • Crystal structure
    • Kintore opencut
    • Kintoreite
    • New South Wales

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