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Bindi, L. & Moelo, Y. (2020) Biagioniite, Tl2SbS2, from the Hemlo gold deposit, Marathon, Ontario, Canada: occurrence and crystal structure. Mineralogical Magazine, 84 390–397.
Added by: Richard Baschera (2020-07-20 13:14:31) Last edited by: Richard Baschera (2020-09-30 16:16:05) |
| Type de référence: Article DOI: 10.1180/mgm.2020.27 Numéro d'identification (ISBN etc.): 0026-461X, 1471-8022 Clé BibTeX: Bindi2020 Voir tous les détails bibliographiques  |
Catégories: IMN, INTERNATIONAL Mots-clés: biagioniite, canada, Hemlo deposit, new mineral, sulfosalt, thallium Créateurs: Bindi, Moelo Collection: Mineralogical Magazine |
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{Biagioniite, ideally Tl2SbS2, is a new mineral from the Hemlo gold deposit, Marathon, Ontario, Canada. It occurs as very rare anhedral crystals up to 65 μm across associated with aurostibite, stibarsen and native gold in a calcite matrix. Biagioniite is opaque with a metallic lustre and shows a black streak. In reflected light biagioniite is moderately bireflectant and not pleochroic. Under crossed polars it is weakly anisotropic with blueish to light-blue rotation tints. Internal reflections are absent.Reflectance percentages for the four standard wavelengths (Rmin and Rmax) are 35.9 and 37.5 (471.1 nm); 34.7 and 36.2 (548.3 nm); 33.8 and 35.3 (586.6 nm); and 31.5 and 33.7 (652.3 nm), respectively. A mean of four electron microprobe analyses gave: Tl 65.12(31), Ag 3.52(9), Sb 20.22(12), S 10.80(8), total 99.66 wt.%, corresponding, on the basis of a total of 5 atoms, to (Tl1.87Ag0.19)Σ2.06Sb0.97S1.97. Biagioniite is monoclinic, space group Pc, with a = 11.0895(9)
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Publisher: Cambridge University Press
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