IMA 2018-014 = aleutite

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Marco E. Ciriotti
Messaggi: 26460
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2018-014 = aleutite

Messaggio da Marco E. Ciriotti » lun 24 giu, 2019 17:33

Prossima pubblicazione.

Referenza:
▪ Siidra, O.I., Nazarchuk, E.V., Agakhanov, A.A., Yury S. Polekhovsky, Y.S. (2019): Aleutite [Cu5O2](AsO4)(VO4)·(Cu0.5□0.5)Cl, a new complex salt-inclusion mineral with Cu2+ substructure derived from Kagome-net. Mineralogical Magazine, 83, (in press).

Abstract:
Aleutite, ideally [Cu5O2](AsO4)(VO4)·(Cu0.5□0.5)Cl, was found in a Yadovitaya fumarole of the Second scoria cone of the Great Fissure Tolbachik eruption, Kamchatka Peninsula, Russia. Aleutite occurs as individual crystals in the masses of polycrystalline anhydrite. Aleutite is monoclinic, C2/m, a = 18.090(2) Å, b = 6.2284(6) Å, c = 8.2465(9) Å, β = 90.597(2)º, V = 929.1(2) Å3, Z = 4 (from single-crystal diffraction data). The empirical formula calculated on the basis of (As+V+Mo+Fe3+) = 2 apfu is
Сu5.40Zn0.05Ca0.01As1.09V0.84Mo0.04Fe0.03K0.05Pb0.02Rb0.01Cs0.01O9.97Cl1.07. The crystal structure was solved by direct methods and refined to an agreement index R1 = 0.066. Aleutite is a new structure type. Aleutite is unique amongst natural and synthetic copper vanadates and arsenates, as it has As5+ and V5+ cations ordered over two tetrahedral sites. The topology of oxocentered bands in aleutite is novel and has not been described before in minerals and synthetic materials. The structural architecture of the band in aleutite can be derived from a kagome network and represents a one-dimensional cut from it. Also aleutite is an interesting and complex example of a natural salt-inclusion phase.

NdR: As,V-chemically analogue of averievite and chemically related to coparsite. Among copper vanadates it is the unique mineral with As5+ and V5+ cations ordered over two tetrahedral sites. Vasilseverginite, Cu9O4(AsO4)2(SO4)2, is the only example of arsenates of fumarolic origin with segregation of tetrahedrally coordinated As5+ and S6+ cations.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 26460
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2018-014 = aleutite

Messaggio da Marco E. Ciriotti » sab 15 feb, 2020 11:38

Pubblicazione effettuata.

Referenza:
▪ Siidra, O.I., Nazarchuk, E.V., Agakhanov, A.A., Yury S. Polekhovsky, Y.S. (2019): Aleutite [Cu5O2](AsO4)(VO4)·(Cu0.5□0.5)Cl, a new complex salt-inclusion mineral with Cu2+ substructure derived from Kagome-net. Mineralogical Magazine, 83, 847-853.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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