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 a¼8.0774(10), b¼15.1772(16), c¼38.129(4) ˚ A, V¼4674.3(9) ˚A3, 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 PbþAs¼43 atoms per formula unit, is Pb28.26As14.74S49.08Cl1.52. Tsugaruite is an N ¼ 4 plesiotypic derivative of the homologous series of Pb-Sb chlorosulfosalts having the general formula Pb(2þ2N)(Sb,Pb)(2þ2N)S(2þ2N)(S,Cl)(4þ2N)ClN. It has a Cl/(ClþS) atomic ratio close to that of other known Pb-Sb chloro-sulfosalts (pillaite, pellouxite) and slightly higher than that of dadsonite.
DETERMINATION OF THE CRYSTAL STRUCTURE AND REDEFINITION OF TSUGARUITE, Pb28As15S50Cl, THE FIRST LEAD-ARSENIC CHLORO-SULFOSALT / C. Biagioni, L. Bindi, K. Momma, R. Miyawaki, Y. Matsushita, Y. Moelo. - In: CANADIAN MINERALOGIST. - ISSN 0008-4476. - STAMPA. - 59:(2021), pp. 125-137.
DETERMINATION OF THE CRYSTAL STRUCTURE AND REDEFINITION OF TSUGARUITE, Pb28As15S50Cl, THE FIRST LEAD-ARSENIC CHLORO-SULFOSALT
L. BindiMembro del Collaboration Group
;
2021
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 a¼8.0774(10), b¼15.1772(16), c¼38.129(4) ˚ A, V¼4674.3(9) ˚A3, 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 PbþAs¼43 atoms per formula unit, is Pb28.26As14.74S49.08Cl1.52. Tsugaruite is an N ¼ 4 plesiotypic derivative of the homologous series of Pb-Sb chlorosulfosalts having the general formula Pb(2þ2N)(Sb,Pb)(2þ2N)S(2þ2N)(S,Cl)(4þ2N)ClN. It has a Cl/(ClþS) atomic ratio close to that of other known Pb-Sb chloro-sulfosalts (pillaite, pellouxite) and slightly higher than that of dadsonite.File | Dimensione | Formato | |
---|---|---|---|
Tsugaruite redefinition and structure.pdf
Accesso chiuso
Tipologia:
Pdf editoriale (Version of record)
Licenza:
Tutti i diritti riservati
Dimensione
603.14 kB
Formato
Adobe PDF
|
603.14 kB | Adobe PDF | Richiedi una copia |
I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.