IMA 2019-A = redefinition of tsugaruite

database, nuove specie, discrediti,
ridefinizioni, classificazioni, ecc.
Rispondi
Avatar utente
Marco E. Ciriotti
Messaggi: 28023
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

IMA 2019-A = redefinition of tsugaruite

Messaggio da Marco E. Ciriotti » ven 09 ott, 2020 14:06

Prossima pubblicazione.

Referenza:
▪ Biagioni, C., Bindi, L., Momma, K., Miyawaki, R., Matsushita, Y., Moëlo, Y. (2020): Determination of the crystal structure and redefinition of tsugaruite, Pb28As15S50Cl, the first lead-arsenic chloro-sulfosalt. Canadian Mineralogist, 58, (in press).
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 28023
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2019-A = redefinition of tsugaruite

Messaggio da Marco E. Ciriotti » gio 06 mag, 2021 10:14

Pubblicazione in corso.

Referenza:
▪ Biagioni, C., Bindi, L., Momma, K., Miyawaki, R., Matsushita, Y., Moëlo, Y. (2020): Determination of the crystal structure and redefinition of tsugaruite, Pb28As15S50Cl, the first lead-arsenic chloro-sulfosalt. Canadian Mineralogist, 58, 2000005.

Abstract:
Tsugaruite was originally defined as a lead-arsenic sulfosalt from the Yunosawa mine, Aomori Prefecture, Japan. Until recently its crystal structure remained unsolved and its actual classification in the sulfosalt realm was unknown. Here the refinement of the crystal structure of tsugaruite using single-crystal X-ray diffraction data is reported. The mineral is orthorhombic, space group P2nn, with unit-cell parameters a = 8.0774(10), b = 15.1772(16), c = 38.129(4) Å, V = 4674.3(9) Å3, in agreement with previous studies. The solution of the crystal structure of this mineral revealed Cl occupying a specific position. Chlorine was thus sought and found using the electron microprobe; the average of six spot analyses gave (in wt.%): Pb 68.04, As 12.83, S 18.29, Cl 0.63, total 99.80. The empirical formula, calculated on the basis of Pb + As = 43 atoms per formula unit, is Pb28.26As14.74S49.08Cl1.52. Tsugaruite is an N = 4 plesiotypic derivative of the homologous series of Pb-Sb chloro-sulfosalts having the general formula Pb(2+2N)(Sb,Pb)(2+2N)S(2+2N)(S,Cl)(4+2N)ClN. It has a Cl/(Cl + S) atomic ratio close to that of other known Pb-Sb chloro-sulfosalts (pillaite, pellouxite) and slightly higher than that of dadsonite.
Marco E. Ciriotti

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

Rispondi

Chi c’è in linea

Visitano il forum: Bing [Bot] e 6 ospiti