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Chiral edge-shared octahedral chains in liskeardite, [(Al,Fe)32(AsO4)18(OH)42(H2O)22]·52H2O, an open framework mineral with a pharmacoalumite-related structure

Published online by Cambridge University Press:  05 July 2018

I. E. Grey ,
W. G. Mumme ,
C. M. Macrae ,
T. Caradoc-Davies ,
J. R. Price ,
M. S. Rumsey  and
S. J. Mills
I. E. Grey*
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
W. G. Mumme
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
C. M. Macrae
Affiliation:
CSIRO Process Science and Engineering, Box 312 Clayton South, Victoria 3169, Australia
T. Caradoc-Davies
Affiliation:
Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
J. R. Price
Affiliation:
Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia
M. S. Rumsey
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
S. J. Mills
Affiliation:
Geosciences, Museum Victoria, GPO Box 666, Melbourne, Victoria 3001, Australia
*
* E-mail: ian.grey@csiro.au
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Abstract

The type specimen of liskeardite, (Al, Fe)3AsO4(OH)6·5H2O, from the Marke Valley Mine, Liskeard District, Cornwall, has been reinvestigated. The revised composition from electron microprobe analyses and structure refinement is [Al29.2Fe2.8(AsO4)18(OH)42(H2O)22]·52H2O. The crystal structure was determined using synchrotron data collected on a 2 μm diameter fibre at 100 K. Liskeardite has monoclinic symmetry, space group I2, with the unit-cell parameters a = 24.576(5), b = 7.754(2) Å, c = 24.641(5) Å, and β = 90.19(1)º. The structure was refined to R = 0.059 for 9769 reflections with I > 3σ(I). It is of an open framework type in which intersecting polyhedral slabs parallel to (101) and (10) form 17.4 Å × 17.4 Å channels along [010], with water molecules occupying the channels. Small amounts (<1 wt.%) of Na, K and Cu are probably adsorbed at the channel walls The framework comprises columns of pharmacoalumite-type, intergrown with chiral chains of six cis edge-shared octahedra. It can be described in terms of cubic close packing, with vacancies at both the anion and cation sites. The compositional and structural relationships between liskeardite and pharmacoalumite are discussed and a possible mechanism for liskeardite formation is presented.

Keywords

liskearditepharmacoalumite-relatedcrystal structurechiral chainCornwallUK
Type
Research Article
Information
Mineralogical Magazine , Volume 77 , Issue 8 , December 2013 , pp. 3125 - 3135
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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