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Type: Journal article
Title: The crystal structure of gatehouseite
Author: Elliott, P.
Pring, A.
Citation: Mineralogical Magazine, 2011; 75(6):2823-2832
Publisher: Mineralogical Society
Issue Date: 2011
ISSN: 0026-461X
Statement of
P. Elliott and A. Pring
Abstract: The crystal structure of the manganese phosphate mineral gatehouseite, ideally Mn2+5(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 Mn2+5(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(P1.76Si0.20As0.07)Σ2.03O8(OH)3.97.
Keywords: Gatehouseite
crystal structure
Rights: Copyright 2011 The Mineralogical Society
DOI: 10.1180/minmag.2011.075.6.2823
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