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

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

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3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalMineralogical Magazine
Issue number2
Early online date2 Mar 2020
Publication statusPublished - 1 Apr 2020

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

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