Neyite from the Yugo-Konevo deposit (Southern Urals, Russia) and its crystal structure

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Abstract

Neyite Ag2Cu6Pb25Bi26S68 was identified in the dumps of Yugo-Konevo tungsten deposit (Chelyabinsk oblast, Southern Urals) for a first time in Russia. This rare sulfosalt forms prismatic crystals up to 3 х 0.5 mm in fluorite-muscovite-quartz veins and is associated with aikinite, tetradymite and pyrite. Reflectance spectra and values of neyite are published for the first time. The chemical composition of neyite is (wt. %, electron microprobe, mean of 7 analyses): Ag 1.75, Cu 3.59, Pb 35.01, Cd 0.12, Bi 42.59, S16.54, total 99.60. The empirical formula calculated based on S = 68 atoms per formula unit is Ag2.14Cu7.45Pb22.27Cd0.14Bi26.86S68. The crystal structure of neyite from Yugo-Konevo was refined on the single crystal, R1 = 3.43 %, wR2 = 7.22 %. The mineral is monoclinic, space group С2/m, a = 37.3900(6) Å, b = 4.05500(10), c = 43.5821(7) Å, β = 108.740(2)°, V = 6257.5(2) Å3, Z = 2. The structure of neyite is based upon three different modules of archetypal PbS structure: (111)PbS slabs of octahedra extended along b alternate with (100)PbS slabs in a direction. Resulting layers are alternated with (922) PbS layers along c. The main structural feature of neyite from Yugo-Konevo deposit that distinguishes it from previously published data on neyite from type locality and cuproneyite is the disorder of Me16 site and the presence of the additional Cu5 site. These features, combined with the bond valence sums analysis, suggest the presence of chains of CuS4 tetrahedra alternating with chains of BiS6 octahedra.

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About the authors

I. V. Kornyakov

Saint Petersburg State University

Author for correspondence.
Email: ikornyakov@mail.ru

Institute of Earth Sciences

Russian Federation, Saint Petersburg; Apatity

A. V. Kasatkin

Fersman Mineralogical Museum RAS

Email: ikornyakov@mail.ru
Russian Federation, Moscow

V. V. Gurzhiy

Saint Petersburg State University

Email: ikornyakov@mail.ru

Institute of Earth Sciences

Russian Federation, Saint Petersburg

R. Škoda

Masaryk University

Email: ikornyakov@mail.ru

Department of Geological Sciences

Czech Republic, Brno

A. M. Kuznetsov

Email: ikornyakov@mail.ru
Russian Federation

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2. Fig. 1. Dumps of the Yugo-Konevo tungsten deposit. Place of neyite sampling is shown by an arrow. FOV ~ 15×10 m. May 2023. Photo: P. M. Andryushchenko.

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3. Fig. 2. Neyite from the Yugo-Konevo tungsten deposit. а — fragment of prismatic crystal in quartz; б — fragments of crystals and grains of neyite showing characteristic iridescence. Photo: M. D. Milshina.

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4. Fig. 3. Aikinite (Aik) and tetradymite (Ttd) inclusions in neyite (Ney) crystal. SEM image, BSE mode.

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5. Fig. 4. Cental part of neyite crystal with aikinite inclusions pictured in Fig. 3, when rotating the microscope stage by 45°. Reflected light, crossed nicols. The difference in anisotropy color effects between aikinite and neyite is well observed.

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6. Fig. 5. Reflectance spectra of neyite and aikinite from Yugo-Konevo deposit.

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7. Fig. 6. A crystal structure of neyite. Legend: red = positions fully occupied by Bi3+; blue = positions fully occupied by Pb2+; yellow = positions occupied by a mixture of Bi3+ and Pb2+; green = positions with admixtures of Ag+ and Cd2+; orange = sulfur; cyan = copper; grey = silver. Dashed black lines denote (111)PbS and (100)PbS modules.

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8. Fig. 7. Trӧmmel diagrams of opposing bond-lengths in the crystal structures of (a) neyite from Yugo-Konevo deposit, our data, (б) neyite from Lime Creek deposit, Canada (Makovicky et al., 2001), and (в) cuproneyite (Ilinca et al., 2012). red diamonds = positions fully occupied by Bi3+; blue squares = positions fully occupied by Pb2+; yellow circles = positions occupied by a mixture of Bi3+ and Pb2+; green triangles = positions with admixtures of Ag+ and Cd2+. Hyperbolas means arrangement of points of idealized polyhedra centered by Bi3+ (red) and Pb2+ (blue). See details in the text.

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9. Fig. 8. Fragments of crystal structures of (a) neyite from Lime Creek deposit, Canada (Makovicky et al., 2001) and (б) neyite from Yugo-Konevo deposit, our data. Legend: red ‒ Bi3+; gray ‒ Ag+; cyan ‒ Cu+; orange ‒ S2–. See details in the text.

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