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Galeaclolusite, [Al6(AsO4)3(OH)9(H2O)4]⋅8H2O, a new bulachite-related mineral from Cap Garonne, France

Published online by Cambridge University Press:  04 December 2020

Ian E. Grey Open the ORCID record for Ian E. Grey [Opens in a new window] ,
George Favreau ,
Stuart J. Mills ,
W. Gus Mumme ,
Catherine Bougerol ,
Helen E.A. Brand ,
Anthony R. Kampf ,
Colin M. MacRae  and
Finlay Shanks
Ian E. Grey*
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria3169, Australia
George Favreau
Affiliation:
421 avenue Jean Monnet, 13090Aix-en-Provence, France
Stuart J. Mills
Affiliation:
Geosciences, Museums Victoria, GPO Box 666, Melbourne, Victoria3001, Australia
W. Gus Mumme
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria3169, Australia
Catherine Bougerol
Affiliation:
Université Grenoble Alpes and CNRS, Institut Néel, 38000, Grenoble, France
Helen E.A. Brand
Affiliation:
Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria3168, Australia
Anthony R. Kampf
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA90007, USA
Colin M. MacRae
Affiliation:
CSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria3169, Australia
Finlay Shanks
Affiliation:
School of Chemistry, Monash University, Clayton, Victoria3800, Australia.
*
*Author for correspondence: Ian E. Grey, Email: ian.grey@csiro.au
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Abstract

Galeaclolusite, [Al6(AsO4)3(OH)9(H2O)4]⋅8H2O, is a new secondary hydrated aluminium arsenate mineral from Cap Garonne, Var, France. It forms crusts and spheroids of white fibres up to 50 μm long by 0.4 μm wide and only 0.1 μm thick. The fibres are elongated along [001] and flattened on (100). The calculated density is 2.27 g⋅cm–3. Optically, galeaclolusite is biaxial with α = 1.550(5), β not determined, γ = 1.570(5) (white light) and partial orientation: Z = c (fibre axis). Electron microprobe analyses coupled with crystal structure refinement results gives an empirical formula based on 33 O atoms of Al5.72Si0.08As2.88O33H34.12. Galeaclolusite is orthorhombic, Pnma, with a = 19.855(4), b = 17.6933(11), c = 7.7799(5) Å, V = 2733.0(7) Å3 and Z = 4. The crystal structure of galeaclolusite was established from its close relationship to bulachite and refined using synchrotron powder X-ray diffraction data. It is based on heteropolyhedral layers, parallel to (100), of composition Al6(AsO4)3(OH)9(H2O)4 and with H-bonded H2O between the layers. The layers contain [001] spiral chains of edge-shared octahedra, decorated with corner-connected AsO4 tetrahedra, that are the same as in the mineral liskeardite.

Keywords

bulachitegaleaclolusitenew mineralCap Garonnecrystal structuresynchrotron
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 2 , April 2021 , pp. 142 - 148
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Oleg I Siidra

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