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Minerals 2018, 8(5), 185; https://doi.org/10.3390/min8050185

Vorontsovite, (Hg5Cu)Σ6TlAs4S12, and Ferrovorontsovite, (Fe5Cu)Σ6TlAs4S12: The Tl- and Tl-Fe-Analogues of Galkhaite from the Vorontsovskoe Gold Deposit, Northern Urals, Russia

1
Fersman Mineralogical Museum of Russian Academy of Sciences, Leninsky Prospekt 18-2, 119071 Moscow, Russia
2
Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, I-35131 Padova, Italy
3
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
4
ul. 40 Let Oktyabra 15, Kalya, 624474 Severouralsk, Sverdlovskaya Oblast’, Russia
5
Institute of Physics ASCR, v. v. i., Na Slovance 1999/2, 18221 Praha 8, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 11 April 2018 / Revised: 24 April 2018 / Accepted: 25 April 2018 / Published: 28 April 2018
(This article belongs to the Special Issue Thallium: Mineralogy, Geochemistry and Ore Processes)
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Abstract

Two new mineral species, vorontsovite, ideally (Hg5Cu)TlAs4S12, and ferrovorontsovite, ideally (Fe5Cu)TlAs4S12, the Tl- and Tl–Fe-analogues of galkhaite, respectively, have been discovered at the Vorontsovskoe gold deposit, Northern Urals, Russia. They occur as anhedral grains up to 0.5 mm (vorontsovite) and 0.2 mm (ferrovorontsovite) embedded in a calcite-dolomite matrix. The chemical composition of vorontsovite (wt %) is: Hg 35.70, Fe 5.36, Zn 1.26, Cu 3.42, Ag 0.64, Tl 11.53, Cs 0.35, Pb 0.04, As 15.98, Sb 2.35, Te 0.41, S 22.70, Se 0.02, total 99.76. The empirical formula, calculated on the basis of 23 atoms pfu, is: [(Hg3.02Fe1.63Zn0.33)Σ4.98(Cu0.91Ag0.10)Σ1.01](Tl0.96Cs0.04)Σ1.00(As3.62Sb0.33Te0.05)Σ4.00S12.01. The composition of ferrovorontsovite (wt %) is: Hg 25.13, Fe 9.89, Zn 1.16, Cu 3.95, Ag 0.45, Tl 12.93, Cs 0.44, Pb 0.04, As 17.83, Sb 2.15, Te 0.40, S 24.91, total 99.28. The empirical formula, calculated on the basis of 23 atoms pfu, is: [(Fe2.74Hg1.94Zn0.27)Σ4.95(Cu0.96Ag0.06)Σ1.02](Tl0.98Cs0.05)Σ1.03(As3.68Sb0.27Te0.05)Σ4.00S12.00. Both minerals are cubic, space group I-43m, with a = 10.2956(6) Å, V = 1091.3(1) Å3, Z = 2 (vorontsovite); and a = 10.2390(7) Å, V = 1073.43(22) Å3, Z = 2 (ferrovorontsovite). The crystal structures of both minerals were refined to R = 0.0376 (vorontsovite) and R = 0.0576 (ferrovorontsovite). Vorontsovite and ferrovorontsovite have been approved by the IMA-CNMNC under the numbers 2016-076 and 2017-007, respectively. The first one is named after the type locality, but also honors the mining engineer Vladimir Vasilyevich Vorontsov. The second is named for its chemical composition, as the Fe-analogue of the first. Both species are isostructural with galkhaite, being its Tl- and Tl–Fe analogues, respectively, and forming altogether the galkhaite group. View Full-Text
Keywords: vorontsovite; ferrovorontsovite; new minerals; thallium; chemistry; crystal structure; galkhaite group; Vorontsovskoe gold deposit vorontsovite; ferrovorontsovite; new minerals; thallium; chemistry; crystal structure; galkhaite group; Vorontsovskoe gold deposit
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Kasatkin, A.V.; Nestola, F.; Agakhanov, A.A.; Škoda, R.; Karpenko, V.Y.; Tsyganko, M.V.; Plášil, J. Vorontsovite, (Hg5Cu)Σ6TlAs4S12, and Ferrovorontsovite, (Fe5Cu)Σ6TlAs4S12: The Tl- and Tl-Fe-Analogues of Galkhaite from the Vorontsovskoe Gold Deposit, Northern Urals, Russia. Minerals 2018, 8, 185.

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