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Biagioni, C., Bonaccorsi, E., Moelo, Y. & Orlandi, P. (2014) Mercury-arsenic sulfosalts from Apuan Alps (Tuscany, Italy). I. Routhierite, (Cu0.8Ag0.2)Hg2Tl(As1.4Sb0.6)(Sigma=2)S-6, from Monte Arsiccio mine: Occurrence and crystal structure. Eur. J. Mineral. 26 163–170.
Added by: Florent Boucher (2016-04-29 09:26:45) |
| Type de référence: Article DOI: 10.1127/0935-1221/2013/0025-2320 Numéro d'identification (ISBN etc.): 0935-1221 Clé BibTeX: Biagioni2014e Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: aghgass3, Apuan Alps, arsenic, cell, crystal structure, definition, della-vena mine, Italy, laffittite, lead-antimony sulfosalts, mercury, Monte Arsiccio, routhierite, sulfosalt, thallium, tuscany Créateurs: Biagioni, Bonaccorsi, Moelo, Orlandi Collection: Eur. J. Mineral. |
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| Résumé |
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Routhierite, similar to(Cu0.8Ag0.2) Hg2Tl(As1.4Sb0.6)(Sigma=2)S-6, was identified in the baryte+pyrite+iron oxide ore from Monte Arsiccio mine, Apuan Alps, Tuscany, Italy. Routhierite occurs as anhedral grains up to 0.5 mm in size forming veinlets embedded in pyrite-rich dolostones, in association with aktashite, baryte, boscardinite, cymrite, protochabourneite, pyrite, realgar, Hg-rich sphalerite, and stibnite. Rarely, euhedral crystals of routhierite were also observed in quartz+baryte+dolomite veins, with boscardinite, Hg-rich oversubstituted andorite, realgar, sphalerite, and Hg-rich tetrahedrite. Electron-microprobe data give (in wt%): Cu 4.79(7), Ag 2.00(5), Fe 0.12(1), Hg 37.31(23), Zn 0.98(1), Cd 0.11(7), Tl 19.19(16), As 9.96(31), Sb 7.16(35), S 18.86(7), Cl 0.05(1), total 100.53(18). The structural formula, based on (S+Cl) = 6 at., is (Cu0.77Ag0.19Fe0.02)(Sigma=0.98)(Hg1.89Zn0.15Cd0.01)(Sigma=2.05)Tl-0.96(As1.35Sb0.60)(Sigma=1.95)(S5.99Cl0.01)(Sigma=6.00). The crystal structure of routhierite from Monte Arsiccio mine was refined to R-1 = 0.030 in the I-42m space group, with unit-cell parameters a 9.9780(5), c 11.3764(7) angstrom, V 1132.6(1) angstrom(3). In the crystal structure of routhierite, (Cu,Ag)S-4 and (Hg,Zn)S-4 tetrahedra share corners to form a framework with channels parallel to [001] hosting TlS6 and (As,Sb)S-3 polyhedra. The relatively short Tl-Tl distance (3.33 angstrom) could indicate Tl-Tl interaction. Chemical and crystallographic data indicate the Sb-rich nature of routhierite from Monte Arsicciomine. The Sb/(Sb+As) atomic ratio is 0.31, to be compared with 0.11-0.12 for routhierite from the type locality of Jas Roux, France. The Sb enrichment of this new occurrence is in agreement with the usual predominance of antimony in sulfosalts from hydrothermal ores of Apuan Alps.
Added by: Florent Boucher |