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

Daniela Mauro, Cristian Biagioni, Marco Pasero, Henrik Sgokby, Federica Zaccarini

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

3 Zitate (Scopus)

Abstract

Coquimbite, AlFe 3+3(SO4)6(H2O)126H2O, was considered as a pure Fe 3+ 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)126H2O; both mineral species belong to the coquimbite group. On the contrary, aluminocoquimbite, Al2Fe2(SO4)6(H2O)126H2O, has a different topology and does not belong to that group.

OriginalspracheEnglisch
Seiten (von - bis)275-282
Seitenumfang8
FachzeitschriftMineralogical Magazine
Jahrgang84.2020
Ausgabenummer2
Frühes Online-Datum2 März 2020
DOIs
PublikationsstatusVeröffentlicht - 1 Apr. 2020

Bibliographische Notiz

Funding Information:
Acknowledgements. Mario Bianchini and Massimo D’Orazio are thanked for providing us with the specimens of coquimbite from the Monte Arsiccio mine. CB acknowledges financial support from the University of Pisa through the project P.R.A. 2018–2019 “Georisorse e Ambiente” (Grant No. PRA_2018_41). Peter Leverett, two anonymous reviewers, and the Associate Editor František Laufek are acknowledged for their comments and corrections.

Publisher Copyright:
Copyright © Mineralogical Society of Great Britain and Ireland 2020.

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