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Tavagnascoite, Bi4O4(SO4)(OH)2, a new oxyhydroxy bismuth sulfate related to klebelsbergite

Published online by Cambridge University Press:  02 January 2018

Luca Bindi*
Affiliation:
Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, I-50121 Firenze, Italy
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
Bruno Martini
Affiliation:
Associazione Micro-mineralogica Italiana, Via Gioconda 3, I-26100 Cremona, Italy
Adrio Salvetti
Affiliation:
Associazione Micro-mineralogica Italiana, Via Gioconda 3, I-26100 Cremona, Italy
Giovanni Dalla Fontana
Affiliation:
Associazione Micro-mineralogica Italiana, Via Gioconda 3, I-26100 Cremona, Italy
Massimo Taronna
Affiliation:
Associazione Micro-mineralogica Italiana, Via Gioconda 3, I-26100 Cremona, Italy
Marco E. Ciriotti
Affiliation:
Associazione Micro-mineralogica Italiana, Via Gioconda 3, I-26100 Cremona, Italy
*

Abstract

The new mineral tavagnascoite, Bi4O4 (SO4)(OH)2, was discovered in the Pb-Bi-Zn-As-Fe-Cu ore district of Tavagnasco, Turin, Piedmont, Italy. It occurs as blocky, colourless crystals, up to 40 μm in size, with a silky lustre. In the specimen studied, tavagnascoite is associated with other uncharacterized secondary Bi-minerals originating from the alteration of a bismuthinite ± Bi-sulfosalt assemblage. Electron microprobe analyses gave (average of three spot analyses, wt.%) Bi2O3 85.32, Sb2O3 0.58, PbO 2.18, SO3 8.46, H2Ocalc 1.77, sum 98.31. On the basis of 10 O apfu, the chemical formula is (Bi3.74Pb0.10Sb0.04)∑ = 3.88O3.68 (SO4)1.08(OH)2, with rounding errors. Main calculated diffraction lines are [d in Å (relative intensity) hkl] 6.39 (29) 012, 4.95 (19) 111,4.019(32)121,3.604(28)014 and 3.213(100)123. Unit-cell parameters are a = 5.831(1), b = 11.925(2), c = 15.123(1) Å, V = 1051.6(3) Å3, Z = 4, space group Pca21. The crystal structure was solved and refined from single-crystal X-ray diffraction data to R 1 = 0.037 on the basis of 1269 observed reflections. It consists of Bi–O polyhedra and SO4 tetrahedra. Bismuth polyhedra are connected each to other to form Bi–O sheets parallel to (001). Successive sheets are linked together by SO4 groups and hydrogen bonds. Tavagnascoite is the Bi-analogue of klebelsbergite, Sb4O4(SO4)(OH)2, and it is the fifth natural known bismuth sulfate without additional cations. The mineral and its name have been approved by the IMA CNMNC (2014-099).

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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