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Redefinition of coquimbite, AlFe3+3(SO4)6(H2O)12⋅6H2O

Published online by Cambridge University Press:  02 March 2020

Daniela Mauro*
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126Pisa, Italy
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126Pisa, Italy
Marco Pasero
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126Pisa, Italy
Henrik Skogby
Affiliation:
Department of Geosciences, Swedish Museum of Natural History, Box 50007, SE-10405Stockholm, Sweden
Federica Zaccarini
Affiliation:
Department of Applied Geological Sciences and Geophysics, University of Leoben, Peter Tunner Str. 5, A-8700Leoben, Austria
*
*Author for correspondence: Daniela Mauro, Email: daniela.mauro@dst.unipi.it

Abstract

Coquimbite, AlFe3+3(SO4)6(H2O)12⋅6H2O, was considered as a pure Fe3+ hydrated sulfate. However, previous mineralogical studies pointed out the occurrence of essential Al, occupying a distinct site in the crystal structure of this mineral. Through the critical re-examination of the available literature and new crystal-chemical data collected on a specimen from the Monte Arsiccio mine, Apuan Alps, Tuscany, Italy, the chemical formula of coquimbite has been revised, taking into account the occurrence of Al. Coquimbite has a homeotypic relationship with paracoquimbite, Fe4(SO4)6(H2O)12⋅6H2O; both mineral species belong to the coquimbite group. On the contrary, aluminocoquimbite, Al2Fe2(SO4)6(H2O)12⋅6H2O, has a different topology and does not belong to that group.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Footnotes

Associate Editor: František Laufek

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