IMA 2016-098 = stracherite

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Marco E. Ciriotti
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IMA 2016-098 = stracherite

Messaggio da Marco E. Ciriotti » gio 21 giu, 2018 20:57

Prossima pubblicazione.

Referenza:
▪ Galuskin, E.V., Krüger, B., Galuskina, I.O., Krüger, H., Vapnik, Y., Pauluhn, A., Olieric, V. (2018): Stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F, the first CO3-bearing intercalated hexagonal antiperovskite from Negev Desert, Israel. American Mineralogist, 103, (in press).

NdR: dissolves in 10% HCl.

Zadovite subgroup

Aradite BaCa6(VO4)2[(SiO4)(VO4)]F trig R-3m 7.1300 7.1300 26.2033 90.00 120.00 90.00 3 1153.63
Gazeevite BaCa6(SiO4)2(SO4)2O trig R-3m 7.1540 7.1540 25.1242 90.00 120.00 90.00 3 1113.58
Stracherite BaCa6(SiO4)2[(PO4)(CO3)]F trig R-3m 7.0877 7.0877 25.201 90.00 120.00 90.00 3 1096.4
Zadovite BaCa6(PO4)2[(SiO4)(PO4)]F trig R-3m 7.0966 7.0966 25.7284 90.00 120.00 90.00 3 1122.13
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: 24698
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2016-098 = stracherite

Messaggio da Marco E. Ciriotti » gio 11 ott, 2018 17:18

Referenza:
▪ Galuskin, E.V., Krüger, B., Galuskina, I.O., Krüger, H., Vapnik, Y., Pauluhn, A., Olieric, V. (2018): Stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F, the first CO3-bearing intercalated hexagonal antiperovskite from Negev Desert, Israel. American Mineralogist, 103, 1699–1706.

Abstract:
The new mineral stracherite, BaCa6(SiO4)2[(PO4)(CO3)]F [R3m, a = 7.0877(5) Å, c = 25.201(2) Å, V = 1096.4(1) Å3, Z = 3], belongs to the zadovite group, which also includes zadovite, BaCa6[(SiO4)(PO4)](PO4)2F; aradite, BaCa6[(SiO4)(VO4)](VO4)2F; and gazeevite, BaCa6(SiO4)2(SO4)2O. All minerals of this group exhibit single-layer antiperovskite modules, which are intercalated with tetrahedral layers. In stracherite, the first CO3-bearing intercalated hexagonal antiperovskite, about 38% of the (PO4)3– tetrahedra are randomly substituted by planar (CO3)2– groups. The mineral was discovered in spurrite rocks of the Hatrurim Complex in the Negev Desert near Arad, Israel. Associated minerals are spurrite, calcite, brownmillerite, shulamitite, CO3-bearing fluorapatite, fluormayenite-fluorkyuygenite, and ariegilatite. The empirical formula of stracherite is: (Ba0.96K0.02Na0.01)S0.99Ca6.01[(SiO4)1.86 (PO4)0.12(AlO4)0.01(TiO4)0.01]S2[(PO4)1.05(CO3)0.75(SO4)0.18(VO4)0.02]S2(F0.95O0.03)S0.98. Poikilitic crystals of stracherite are up to 0.5 mm in size and are confined to re-crystallization zones of spurrite marbles under the influence of by-products (gases, fluids) of combustion metamorphism.
Marco E. Ciriotti

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