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The crystal structure of Ni-rich gordaite–thérèsemagnanite from Cap Garonne, France

Published online by Cambridge University Press:  14 March 2019

Stuart J. Mills ,
Owen P. Missen  and
Georges Favreau
Stuart J. Mills*
Affiliation:
Geosciences, Museums Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia
Owen P. Missen
Affiliation:
Geosciences, Museums Victoria, GPO Box 666, Melbourne 3001, Victoria, Australia School of Earth, Atmosphere and Environment, Monash University, Clayton 3800, Victoria, Australia
Georges Favreau
Affiliation:
421 Avenue Jean Monnet, Aix-en-Provence, 13090, France
*
*Author for correspondence: Stuart J. Mills, Email: smills@museum.vic.gov.au
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Abstract

The crystal structure of Ni-rich gordaite–thérèsemagnanite has been determined from a sample collected at pillar 80 in the North mine, Cap Garonne, Var, France. The structure was refined to R1 = 0.0693 for 935 reflections with I > 2σ(I). The mineral is isostructural with gordaite, forming a layered structure with an extensive hydrogen-bonding network. The possible polytypic relationship between gordaite, thérèsemagnanite and guarinoite is also discussed. The guarinoite formula (Zn,Co,Ni)6(SO4)(OH,Cl)10·5H2O is also likely to be incorrect and is more likely to be Na(Zn,Co)4(SO4)(OH)6Cl·5–6H2O, meaning that guarinoite is equivalent to Co-rich gordaite-2H and would not be a distinct mineral species.

Keywords

thérèsemagnanitegordaiteCap Garonnecrystal structurepolytypesolid solutionguarinoite
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 3 , June 2019 , pp. 459 - 463
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: Anthony R Kampf

References

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