IMA 2017-G = gabrielsonite revisited: crystal structure determination and redefinition of chemical formula

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Marco E. Ciriotti
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Iscritto il: ven 25 giu, 2004 11:31
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IMA 2017-G = gabrielsonite revisited: crystal structure determination and redefinition of chemical formula

Messaggio da Marco E. Ciriotti » lun 11 giu, 2018 11:54

Prossima pubblicazione.

Referenza:
▪ Perchiazzi, N., Hålenius, U., Vignola, P., Demitri, N. (2018): Gabrielsonite revisited: crystal structure determination and redefinition of chemical formula. European Journal of Mineralogy, 30, (in press).
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
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2017-G = gabrielsonite revisited: crystal structure determination and redefinition of chemical formula

Messaggio da Marco E. Ciriotti » mar 04 set, 2018 17:29

Referenza:
▪ Perchiazzi, N., Hålenius, U., Vignola, P., Demitri, N. (2018): Gabrielsonite revisited: crystal structure determination and redefinition of chemical formula. European Journal of Mineralogy, 30, (in press).

Abstract:
A reinvestigation of gabrielsonite from the holotype specimen from Långban, central Sweden, using single-crystal synchrotron diffraction, electron-microprobe techniques and Fourier-transform infrared (FTIR) spectroscopy, Raman and Mössbauer spectroscopies show that the mineral is an anhydrous Fe3+-bearing arsenite and not a hydrous Fe2+-bearing arsenate, as originally proposed. The revised ideal chemical formula of gabrielsonite is PbFe3+(As3+O3)O. The mineral is related to the descloizite supergroup, but it differs through the valencies of the non-Pb cations Fe (M3+ vs. M2+) and As (3 + vs. 4 +) and through lower coordination of Pb (4 vs. 7–8) and As (3 vs. 4). The redefinition of gabrielsonite (proposal 17-G) has been approved by the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association.
Marco E. Ciriotti

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