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Orlandi, P., Biagioni, C., Bonaccorsi, E., Moelo, Y. & Paar, W. H. (2012) LEAD-ANTIMONY SULFOSALTS FROM TUSCANY (ITALY). XII. BOSCARDINITE, TIPb4(Sb7As2)(Sigma 9)S-18, A NEW MINERAL SPECIES FROM THE MONTE ARSICCIO MINE: OCCURRENCE AND CRYSTAL STRUCTURE. Can. Mineral. 50 235–251.
Added by: Laurent Cournède (2016-03-10 21:28:39) |
| Type de référence: Article DOI: 10.3749/canmin.50.2.235 Numéro d'identification (ISBN etc.): 0008-4476 Clé BibTeX: Orlandi2012 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: antimony, Apuan Alps, arsenic, baumhauerite, binntal switzerland, boscardinite, chemistry, classification, fornovolasco, Italy, lead, lengenbach, Monte Arsiccio mine, new mineral species, refinement, sartorite, sulfosalt, thallium, tuscany Créateurs: Biagioni, Bonaccorsi, Moelo, Orlandi, Paar Collection: Can. Mineral. |
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| Résumé |
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{The new mineral species boscardinite was discovered in the barite - pyrite - iron oxides deposit of Monte Arsiccio, near Sant'Anna di Stazzema, in the Apuan Alps, Tuscany, Italy. It forms a millimetric compact mass in a quartz vein embedded in dolomitic rocks. Other associated sulfides are stibnite and zinkenite. Boscardinite is metallic grey. Under the ore microscope, it is white; pleochroism is not discernible. Anisotropism is distinct, with an ubiquitous polysynthetic twinning; rotation tints are in shades of grey. Minimum and maximum reflectance data for COM wavelengths [gimel (nm), R-air (\%)] are: 470: 33.8/39.3, 546: 32.1/38.0, 589: 31.2/36.9, 650: 29.7/35.3. The hardness was not measured owing to the scarcity of the available material. Electron-microprobe analyses of two samples gave (wt. \%, result mean of five analyses): 1) sample 4977: Ag 1.48(4), Tl 9.72(26), Pb 23.36(20), Sb 35.25(60), As 5.78(10), S 22.14(45), Se 0.04(1), total 97.77(90); 2) sample 4989: Ag 1.37(7), Tl 8.96(19), Pb 25.74(20), Sb 33.46(32), As 6.54(8), S 22.08(29), Se 0.01(1), total 98.16(63). On the basis of Sigma Me = 14 apfu, they lead to the formulae Ag0.36Tl1.23Pb2.92(Sb7.50As2.00)Sigma 9.50S17.88Se0.01 and Ag0.33Tl1.13Pb3.20(Sb7.09As2.25)(Sigma 9.34)S-17.76, respectively. A single-crystal X-ray study of boscardinite indicates triclinic symmetry, space group P (1) over bar, with a 8.0929(4), b 8.7610(5), c 22.4971(11) A, alpha 90.868(4), beta 97.247(4), gamma 90.793(4)degrees, V 1582.0(2) A(3)
Added by: Laurent Cournède |