Modular structure and disorder of a new mineral Ba2Ca18(SiO4)6(PO4)3(CO3)F3O - single and triple antiperovskite layers

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Marco E. Ciriotti
Messaggi: 24696
Iscritto il: ven 25 giu, 2004 11:31
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Modular structure and disorder of a new mineral Ba2Ca18(SiO4)6(PO4)3(CO3)F3O - single and triple antiperovskite layers

Messaggio da Marco E. Ciriotti » ven 31 ago, 2018 9:00

Prossima pubblicazione.

Referenza:
▪ Krüger, B., Krüger, H., Galuskin, E.V., Galuskina, I.O., Vapnik, Y., Olieric, V., Pauluhn, A. (2018): Ba2Ca18(SiO4)6(PO4)3(CO3)F3O: modular structure and disorder of a new mineral with single and triple antiperovskite layers. Acta Crystallographica, B74, (in press).

Synopsis:
The crystal structure of a new modular antiperovskite mineral is solved using synchrotron radiation and its disorder is modelled.
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: 24696
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Modular structure and disorder of a new mineral Ba2Ca18(SiO4)6(PO4)3(CO3)F3O - single and triple antiperovskite laye

Messaggio da Marco E. Ciriotti » ven 31 ago, 2018 13:37

Menzione di questa potenziale nuova specie minerale è nel lavoro sulla ariegilatite: viewtopic.php?f=5&t=14388&p=246069&hili ... te#p246069

Referenza:
▪ Galuskin, E.V., Krüger, B., Galuskina, I.O., Krüger, H., Vapnik, Y., Wojdyla, J.A., Murashko, M. (2018): New Mineral with Modular Structure Derived from Hatrurite from the Pyrometamorphic Rocks of the Hatrurim Complex: Ariegilatite, BaCa12(SiO4)4(PO4)2F2O, from Negev Desert, Israel. Minerals, 8, 109; doi:10.3390/min8030109.

Abstract:
Ariegilatite, BaCa12(SiO4)4(PO4)2F2O (R¯3m, a = 7.1551(6) Å, c = 41.303(3) Å, V = 1831.2(3) Å3, Z = 3), is a new member of the nabimusaite group exhibiting a modular intercalated antiperovskite structure derived from hatrurite. It was found in a few outcrops of pyrometamorphic rocks of the Hatrurim Complex located in the territories of Israel, Palestine and Jordan. The holotype specimen is an altered spurrite marble from the Negev Desert near Arad city, Israel. Ariegilatite is associated with spurrite, calcite, brownmillerite, shulamitite, CO3-bearing fluorapatite, fluormayenite-fluorkyuygenite and a potentially new mineral, Ba2Ca18(SiO4)6(PO4)3(CO3)F3O. Ariegilatite is overgrown and partially replaced by stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F. The mineral forms flat disc-shaped crystals up to 0.5 mm in size. It is colorless, transparent, with white steaks and vitreous luster. Optically, ariegilatite is uniaxial, negative: ω = 1.650(2), ε = 1.647(2) (λ = 589 nm). The mean composition of the holotype ariegilatite, (Ba0.98K0.01Na0.01)Σ1(Ca11.77Na0.08Fe2+0.06Mn2+0.05Mg0.04)Σ12(Si3.95Al0.03Ti0.02)Σ4(P1.70C0.16Si0.10S6+0.03V0.01)Σ2F2.04O0.96, is close to the end-member formula. The structure of ariegilatite is described as a stacking of the two modules {F2OCa12(SiO4)4}4+ and {Ba(PO4)2}4− along (001). Ariegilatite, as well as associated stracherite, are high-temperature alteration products of minerals of an early clinker-like association. These alterations took place under the influence of pyrometamorphism by-products, such as gases and fluids generated by closely-spaced combustion foci.
Marco E. Ciriotti

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