Mg-rich wolfeite, (FeII,Mg)2(PO4)(OH): Structure refinement and Raman spectroscopic data

Autor(en)

Uwe Kolitsch

Abstrakt

Mg-rich wolfeite [diiron(II) hydroxide phosphate], (FeII,Mg) 2(PO4)(OH), from the Big Fish River area, Yukon Territory, Canada, is isotypic with its MnII-dominant analogue triploidite. The framework structure contains edge- and corner-sharing, distorted MO 4(OH) and MO4(OH)2 (M = FeII or FeII,Mg) polyhedra linked by fairly regular PO4 tetrahedra. All atoms are on general positions. Four of the eight independent Fe sites contain between 9 and 25% Mg substituting for Fe. Two of these four sites show distorted trigonal-bipyramidal coordination, whereas the remaining two sites show distorted octahedral coordination. The average (FeII,Mg)-O bond length decreases with increasing Mg content. Average P-O distances range between 1.538 and 1.543 A. The hydrogen bonds are all strongly bent and weak, with O?O distances > 2.73 A°, an observation confirmed by single-crystal Raman spectroscopic data which show five bands due to O-H stretching vibrations between 3478 and 3557 cm-1. Œ 2003 International Union of Crystallography Printed in Great Britain - all rights reserved.

Organisation(en)

Institut für Mineralogie und Kristallographie

Journal

Acta Crystallographica. Section E: Structure Reports Online

Band

59

ISSN

1600-5368

Publikationsdatum

2003

Peer-reviewed

Ja

ÖFOS 2012

1051 Geologie, Mineralogie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e950467c-4529-4f2b-a01e-becb6caa9419