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


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.

Copyright © Mineralogical Society of Great Britain and Ireland 2020

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Associate Editor: František Laufek


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