Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/66244
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Type: Journal article
Title: The crystal structure of perloffite
Author: Elliott, P.
Willis, A.
Citation: Mineralogical Magazine, 2011; 75(2):317-325
Publisher: Mineralogical Society
Issue Date: 2011
ISSN: 0026-461X
1471-8022
Statement of
Responsibility: 
P. Elliott and A.C. Willis
Abstract: The structure of perloffite, ideally BaMn2+ 2Fe3+ 2(PO4)3(OH)3, has been solved and refined from single-crystal X-ray data collected on a Sr-bearing sample from the Spring Creek copper mine, near Wilmington, South Australia. A fragment of the crystal used for the collection of the X-ray intensity data was analysed by electron microprobe. The resulting unit formula is (Ba1.00,Sr0.03)Σ1.03(Mn2+ 1.15,Fe2+ 0.76Ca0.05Mg0.02,Na0.01)Σ1.99(Fe3+ 1.94,Al0.06)Σ2.00(PO4)2.99(OH)3.04. The structure is monoclinic, space group P21/m, a = 9.2425(18), b = 12.470(3), c = 5.002(1) Å, β = 100.19(3)°, V = 567.41(19) Å3, Z = 2, and was refined to R 1 = 4.71% for 1568 unique observed reflections. The X site is [11]-coordinated and is occupied by dominant Ba and minor Sr, with an <X—O> distance of 2.953 Å. The M1 site is octahedrally coordinated and is occupied by Mn2+ and Fe2+ plus minor Ca, Mg and Na with an observed <M1—O> distance of 2.208 Å. The M2 site is also octahedrally coordinated and is occupied by Fe3+ plus minor Al with a <M2—O> distance of 2.018 Å. Perloffite is isostructural with other members of the bjarebyite group. Edge-linked [M22O6(OH)4] dimers link via corners to form chains along [010]. Chains are decorated with PO4 tetrahedra and link in the a direction via [M1O5(OH)] octahedra and (Ba,Sr) atoms to form a complex framework. The H2 atom hydrogen-bonds strongly to the O3 anion, providing additional linkage between chains.
Keywords: perloffite
crystal structure
X-ray diffraction
bjarebyite group.
Rights: © 2011 The Mineralogical Society. Website © 2011 Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article
DOI: 10.1180/minmag.2011.075.2.317
Appears in Collections:Aurora harvest 5
Earth and Environmental Sciences publications

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