IMA 2015-010 = sulfhydrylbystrite

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Marco E. Ciriotti
Messaggi: 23535
Iscritto il: ven 25 giu, 2004 11:31
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IMA 2015-010 = sulfhydrylbystrite

Messaggio da Marco E. Ciriotti » gio 05 mag, 2016 16:07

Referenza:
▪ Sapozhnikov, A.N., Kaneva, E.P., Surorova, L.P., Levitsky, V.I., Ivanova, L.A. (2017): Sulfhydrylbystrite, Na5K2Ca(Al6Si6O24)(S5)(SH), a new mineral with the LOS framework, and re-interpretation of bystrite: cancrinite-group minerals with novel extra-framework anions. Mineralogical Magazine, 81, (in press).

Abstract:
Sulfhydrylbystrite, Na5K2Ca(Al6Si6O24)(S5)(SH), cell parameters a = 12.9567(6) Å, c = 10.7711(5) Å, space group P31c, is a new mineral belonging to the cancrinite group. It was found at Malaya Bystraya lazurite deposit, Lake Baikal area, Eastern Siberian Region, Russia, associated with lazurite, calcite, diopside, phlogopite and pyrite. The mineral develops at the margins of masses of lazurite, replacing it in some areas with the formation of nonequilibrium lazurite-diopside-sulfhydrylbystrite association. It is translucent, yellow to orange, with vitreous lustre, yellow streak and Mohs’ hardness of 4.5 - 5. The empirical formula, based on 12 (Si + Al), is Na5.17K1.87Ca0.99[Al6.01Si5.99O24](S5)2- 0.86(SH0.86)Cl0.07, Z=2. The crystal structure of sulfhydrylbystrite may be described as an ABAC stacking of six-membered rings of 23 SiO4 and AlO4 tetrahedra and extra-framework cations and anions located within structural cages. There are two type of cages, cancrinite and losod, stacked into chains at at (0, 0, z) and (⅔, ⅓, z), respectively. The cancrinite cage hosts Ca2+ and (SH)- ions, whereas (S5)2- polyanion is in the losod cage associated with Na+ and K+ cations. In addition, (SH)- and (S5)2- anions are for the first time detected in the structure of a mineral. For comparison, a structural and compositional study of bystrite sample from the same deposit was carried out. Bystrite is confirmed to contain pentasulfide anions in the losod cages, similar to those of sulfhydrylbystrite, in contrast to previous studies. However, bystrite has chloride in cancrinite cages, whereas sulfhydrylbystrite has hydrosulfide in that position. The unit cell parameters are distinctly different: bystrite has a = 12.8527(6) Å, c = 10.6907(5) Å in the same P31c space group.

NB: La formula della bystrite è la seguente: Na7Ca[(Al6Si6)O24](S5)2-Cl-
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: 23535
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2015-010 = sulfhydrylbystrite

Messaggio da Marco E. Ciriotti » gio 30 mar, 2017 11:34

Pubblicazione effettuata.

Referenza:
▪ Sapozhnikov, A.N., Kaneva, E.P., Surorova, L.P., Levitsky, V.I., Ivanova, L.A. (2017): Sulfhydrylbystrite, Na5K2Ca(Al6Si6O24)(S5)(SH), a new mineral with the LOS framework, and re-interpretation of bystrite: cancrinite-group minerals with novel extra-framework anions. Mineralogical Magazine, 81, 383–402.

Bystrite Na7Ca[(Al6Si6)O24]S2-5Cl-
Carbobystrite Na16(Al12Si12O48)(CO3)2·8H2O
Sulfhydrylbystrite Na5K2Ca[Al6Si6O24]S2-5(SH)-
Marco E. Ciriotti

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