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Biagioni, C., Orlandi, P., Moelo, Y. & Bindi, L. (2014) Lead-antimony sulfosalts from Tuscany (Italy). XVI. Carducciite, (AgSb)Pb-6(As,Sb)(8)S-20, a new Sb-rich derivative of rathite from the Pollone mine, Valdicastello Carducci: occurrence and crystal structure. Mineral. Mag. 78 1775–1793.
Added by: Laurent Cournède (2016-03-10 21:01:54) |
| Type de référence: Article DOI: 10.1180/minmag.2014.078.7.19 Numéro d'identification (ISBN etc.): 0026-461X Clé BibTeX: Biagioni2014 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: alps, antimony, Apuan Alps, arsenic, as)(22)(as-as)s-56, barikaite, carducciite, commission, crystal structure, cu(ag, cu)(3)pb-19(sb, Italy, lead, lengenbach, new mineral, parasterryite, Pollone mine, rathite, sartorite, series, silver, sterryite, sulfosalt, switzerland, tuscany Créateurs: Biagioni, Bindi, Moelo, Orlandi Collection: Mineral. Mag. |
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{The new mineral species carducciite, (AgSb)Pb-6(As,Sb)(8)S-20, has been discovered in the baryte-pyrite-(Pb-Ag-Zn) deposit of the Pollone mine, near Valdicastello Carducci, Apuan Alps, Tuscany, Italy. It occurs as black metallic prismatic crystals, up to 0.5 mm long, associated with pyrite and sterryite. Its Vickers hardness (VHN10) is 61 kg/mm(2) (range: 52 - 66), corresponding to a Mohs hardness of similar to 21/2 - 3. In reflected light, carducciite is dark grey in colour, moderately bireflectant; internal reflections are very weak and deep red in colour. Reflectance percentages for the four COM wavelengths [R-min, R-max (\%) (lambda)] are: 35.8, 40.8 (471.1 nm), 33.7, 39.0 (548.3 nm), 32.7, 37.6 (586.6 nm) and 30.4, 35.1 (652.3 nm). Electron microprobe analysis gives (wt.\% - mean of six analyses): Ag 3.55(12), Tl 0.13(3), Pb 41.90(42), Sb 17.79(19), As 12.41(14), S 22.10(17), total 97.9(6). On the basis of Sigma Me = 16 a.p.f.u., the chemical formula is Ag0.96Tl0.02Pb5.91As4.84Sb4.27S20.14. The main diffraction lines, corresponding to multiple hkl indices, are (relative visual intensity): 3.689 (s), 3.416 (s), 3.125 (s), 2.989 (s), 2.894 (s), 2.753 (vs), 2.250 (s). The crystal-structure study gives a monoclinic unit cell, space group P2(1)/c, with a 8.4909(3), b 8.0227(3), c 25.3957(9) angstrom, beta 100.382(2)degrees, V 1701.63(11) angstrom
Added by: Laurent Cournède |