TY - JOUR
T1 - The crystal structure of kintoreite, PbFe3(PO4)2(OH,H2O)6
AU - Kharisun, null
AU - Taylor, M. R.
AU - Bevan, D. J M
AU - Pring, A.
PY - 1997/2/1
Y1 - 1997/2/1
N2 - 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.
AB - 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.
KW - Beudantite
KW - Corkite
KW - Crystal structure
KW - Kintore opencut
KW - Kintoreite
KW - New South Wales
UR - http://www.scopus.com/inward/record.url?scp=0030825417&partnerID=8YFLogxK
U2 - 10.1180/minmag.1997.061.404.12
DO - 10.1180/minmag.1997.061.404.12
M3 - Article
AN - SCOPUS:0030825417
SN - 0026-461X
VL - 61
SP - 123
EP - 129
JO - Mineralogical Magazine
JF - Mineralogical Magazine
IS - 404
ER -