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Biagioni, C., Moelo, Y., Orlandi, P. & Paar, W. H. (2018) Lead-antimony sulfosalts from Tuscany (Italy). XXIII. Andreadiniite, CuAg7HgPb7Sb24S48, a new oversubstituted (Cu,Hg)-rich member of the andorite homeotypic series from the Monte Arsiccio mine, Apuan Alps. Eur. J. Mineral. 30 1021–1035.
Added by: Richard Baschera (2018-12-20 08:40:35) Last edited by: Richard Baschera (2018-12-20 08:41:26) |
| Type de référence: Article DOI: 10.1127/ejm/2018/0030-2765 Numéro d'identification (ISBN etc.): 0935-1221 Clé BibTeX: Biagioni2018b Voir tous les détails bibliographiques  |
Catégories: IMN, INTERNATIONAL Mots-clés: andreadiniite, antimony, Apuan Alps, as-sb member, chemistry, Copper, crystal structure, crystal-structure, fizelyite, gustavite, jas roux, lead, levigliani, lillianite homologous series, mercury, new mineral, oscarkempffite, silver, sulfosalt, uchucchacuaite Créateurs: Biagioni, Moelo, Orlandi, Paar Collection: Eur. J. Mineral. |
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| Résumé |
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{The new mineral species andreadiniite, CuAg7HgPb7Sb24S48, was discovered in a quartz vein embedded in metadolostone from the Sant'Olga tunnel, Monte Arsiccio mine, Stazzema, Apuan Alps, Tuscany, Italy. It occurs as black anhedral grains, up to some mm in size, with a metallic luster, associated with sphalerite and stibnite. Under the ore microscope, andreadiniite is white, with a slightly yellow-bronze tint. Pleochroism was not observed. Anisotropism is weak, in shades of gray to bluish-gray. Reflectance percentages for the four COM wavelengths are [R-min, R-max (%), (lambda)]: 34.8, 36.4 (470 nm); 33.5, 35.1 (546 nm); 32.9, 35.0 (589 nm); and 31.8, 32.4 (650 nm). Electron-microprobe analysis gave (in wt% - average of seven spot analyses): Cu 1.06(2), Ag 11.25(18), Tl 0.45(9), Hg 2.76 (14), Pb 19.95(16), As 1.55(5), Sb 40.45(21), S 22.23(11), total 99.70(42). On the basis of Sigma Me= 40 atoms per formula unit, the chemical formula is Cu1.14Ag7.12Tl0.15Hg0.94Pb6.57(Sb22.68As1.41) S24.09S47.33, ideally CuAg7HgPb7Sb24S48. The main diffraction lines, corresponding to multiple hkl indices, are [d in angstrom (relative visual intensity)]: 3.719 (ms), 3.406 (s), 3.277 (s), 2.885 (s), 2.740 (ms), 2.131 (ms), 2.055 (s), and 1.788(s). The crystal structure study gave a monoclinic pseudo-orthorhombic unit cell, space group P2(1)/c, with a = 19.0982(14)
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