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Biagioni, C., Moelo, Y., Perchiazzi, N., Demitri, N. & Lepore, G. O. (2018) Lead-Antimony Sulfosalts from Tuscany (Italy). XXIV. Crystal Structure of Thallium-Bearing Chovanite, TlPb26(Sb,As)(31)S72O, from the Monte Arsiccio Mine, Apuan Alps. Minerals, 8 535. 
Added by: Richard Baschera (2018-12-20 09:04:18)   Last edited by: Richard Baschera (2018-12-20 09:09:43)
Type de référence: Article
DOI: 10.3390/min8110535
Numéro d'identification (ISBN etc.): 2075-163X
Clé BibTeX: Biagioni2018c
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Catégories: IMN, INTERNATIONAL
Mots-clés: antimony, Apuan Alps, bond-valence parameters, chemistry, chovanite, crystal structure, Italy, lead, Monte Arsiccio mine, Oxygen, sulfosalt, thallium
Créateurs: Biagioni, Demitri, Lepore, Moelo, Perchiazzi
Collection: Minerals
Consultations : 7/460
Indice de consultation : 3%
Indice de popularité : 0.75%
Résumé     
{thallium-bearing variety of the lead-antimony oxysulfosalt chovanite from the Monte Arsiccio mine (Apuan Alps, Tuscany, Italy) has been reexamined. It occurs as thin, ribbon-like crystals, black in color, up to 5 mm in length in vugs of dolomite +/- baryte +/- quartz veins embedded in the metadolostone of the Sant'Olga level. Associated minerals are rouxelite, robinsonite, sphalerite, valentinite, baryte, dolomite, quartz, and Ba-rich K-feldspar. Chemical analysis pointed to contents of Tl up to 0.86 apfu, corresponding to the ideal chemical formula TlPb26(Sb,As)(31)S72O. The structural role of thallium has been investigated using single-crystal X-ray diffraction using synchrotron radiation (lambda = 0.59040 angstrom). Thallium-rich chovanite is monoclinic, space group P2(1)/c, with unit-cell parameters a = 34.280(3)
  
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