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Orlandi, P., Moelo, Y. & Biagioni, C. (2010) Lead-antimony sulfosalts from Tuscany (Italy). X. Dadsonite from the Buca delta Vena mine and Bi-rich izoklakeite from the Seravezza marble quarries. Period. Mineral. 79 113–121.
Added by: Laurent Cournède (2016-03-10 21:37:33) |
| Type de référence: Article DOI: 10.2451/2010PM0006 Numéro d'identification (ISBN etc.): 0369-8963 Clé BibTeX: Orlandi2010 Voir tous les détails bibliographiques  |
Catégories: CESES Mots-clés: Apuan Alps, Buca della Vena, crystal-structure, dadsonite, definition, giessenite, izoklakeite, lead sulfosalt, levigliani, northern apennines, oxy-chloro-sulfosalt, Pressure, refinement, Seravezza, temperature Créateurs: Biagioni, Moelo, Orlandi Collection: Period. Mineral. |
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Two very rare Pb sulfosalts, dadsonite and izoklakeite, discovered in the Apuan Alps, represent the first Italian occurrence and were characterized by electron probe microanalysis and X-ray diffraction. Dadsonite from the Buca della Vena Ba-Fe deposit (two samples) has formula and Pb(22.64)Sb(24.90)S(60)Cl(1.12) and (Pb(22.90)Cu(0.01))Sb(25.12)S(60)Cl(1.07), in fair agreement with the ideal formula Pb(23)Sb(25)S(60)Cl.. XRPD gives the monoclinic unit cell a 19.058(3), b 8.234(2), c 17.352(3) angstrom, beta 96.33(2)degrees. Dadsdnite, with both pillaite and pellouxite, is the third chloro-sulfosalt from Buca della Vena, that reveals a high chlorinity of mineralizing solutions. Izoklakeite from Seravezza has the mean composition (wt.\%) Pb 45.69, Bi 24.89, Sb 8.16, Cu 1.08, Ag 0.74, Hg 0.29, S 15.43, Se 2.86, sum 99.14, with structural formula Cu(1.92)[Ag(0.77)Hg(0.16)Pb(24.49)(Bi(13.23)Sb(7.44))(Sigma=20.67)](Sigma=46.09)(S(53.43) Se(4.02))(Sigma-57.45). It is a Bi-rich izoklakeite, close to the ideal Fe- and Ag-free formula, Cu(2)Pb(26)(Bi,Sb)(20)S(57). Significant Se and Hg contents constitute chemical peculiarities of this occurrence. XRPD gives the orthorhombic unit cell a 34.272(4), b 38.351(5), c 4.098(1) angstrom.
Added by: Laurent Cournède |