Journal
MINERALOGICAL MAGAZINE
Volume 84, Issue 2, Pages 275-282Publisher
MINERALOGICAL SOC
DOI: 10.1180/mgm.2020.15
Keywords
coquimbite; iron; aluminium; sulfate; paracoquimbite; aluminocoquimbite; coquimbite group
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Funding
- University of Pisa [PRA_2018_41]
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Coquimbite, AlFe33+(SO4)(6) (H2O)(12)center dot 6H(2)O, 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, Fe-4 (SO4)(6) (H2O)(12)center dot 6H(2)O; both mineral species belong to the coquimbite group. On the contrary, aluminocoquimbite, Al-2 Fe-2 (SO4)(6) (H2O)(12)center dot 6H(2)O, has a different topology and does not belong to that group.
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