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The crystal structure of gatehouseite

Published online by Cambridge University Press:  05 July 2018

P. Elliott  and
A. Pring
P. Elliott*
Affiliation:
Tectonics, Resources and Exploration (TRaX), School of Earth and Environmental Sciences, The University of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
A. Pring
Affiliation:
South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
*
*E-mail: [email protected]
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Abstract

The crystal structure of the manganese phosphate mineral gatehouseite, ideally Mn52+(PO4)2(OH)4, space group P212121, a = 17.9733(18), b = 5.6916(11), c = 9.130(4) Å, V= 933.9(4) Å3, Z = 4, has been solved by direct methods and refined from single-crystal X-ray diffraction data (T = 293 K) to an R index of 3.76%. Gatehouseite is isostructural with arsenoclasite and with synthetic Mn52+(PO4)2(OH)4. The structure contains five octahedrally coordinated Mn sites, occupied by Mn plus very minor Mg with observed <Mn—O> distances from 2.163 to 2.239 Å. Two tetrahedrally coordinated P sites, occupied by P, Si and As, have <P—O> distances of 1.559 and 1.558 Å. The structure comprises two types of building unit. A strip of edge-sharing Mn(O,OH)6 octahedra, alternately one and two octahedra wide, extends along [010]. Chains of edge- and corner-shared Mn(O,OH)6 octahedra coupled by PO4 tetrahedra extend along [010]. By sharing octahedron and tetrahedron corners, these two units form a dense three-dimensional framework, which is further strengthened by weak hydrogen bonding. Chemical analyses by electron microprobe gave a unit formula of (Mn4.99Mg0.02)Σ5.01(P1.76Si0.07(As0.07)Σ2.03O8(OH)3.97.

Keywords

gatehouseitemanganesephosphatecrystal structure
Type
Research Article
Information
Mineralogical Magazine , Volume 75 , Issue 6 , December 2011 , pp. 2823 - 2832
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2011

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