Redefinition of coquimbite, AlFe3+3(SO4)6(H2O)12⋅6H2O
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In: Mineralogical Magazine, Vol. 84.2020, No. 2, 01.04.2020, p. 275-282.
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TY - JOUR
T1 - Redefinition of coquimbite, AlFe3+3(SO4)6(H2O)12⋅6H2O
AU - Mauro, Daniela
AU - Biagioni, Cristian
AU - Pasero, Marco
AU - Sgokby, Henrik
AU - Zaccarini, Federica
N1 - Publisher Copyright: Copyright © Mineralogical Society of Great Britain and Ireland 2020.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85084530306&partnerID=8YFLogxK
U2 - 10.1180/mgm.2020.15
DO - 10.1180/mgm.2020.15
M3 - Article
VL - 84.2020
SP - 275
EP - 282
JO - Mineralogical Magazine
JF - Mineralogical Magazine
SN - 0026-461X
IS - 2
ER -
