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Selenolaurite, RuSe2, a new mineral from the Ingul gold placer, South Urals, Russia

Published online by Cambridge University Press:  15 January 2025

Elena V. Belogub Open the ORCID record for Elena V. Belogub [Opens in a new window] ,
Sergey N. Britvin Open the ORCID record for Sergey N. Britvin [Opens in a new window] ,
Vladimir V. Shilovskikh Open the ORCID record for Vladimir V. Shilovskikh [Opens in a new window] ,
Leonid A. Pautov ,
Vasiliy A. Kotlyarov ,
Maria G. Krzhizhanovskaya Open the ORCID record for Maria G. Krzhizhanovskaya [Opens in a new window] ,
Konstantin A. Novoselov Open the ORCID record for Konstantin A. Novoselov [Opens in a new window] ,
Elisaveta V. Zaykova  and
Ivan A. Blinov Open the ORCID record for Ivan A. Blinov [Opens in a new window]
Elena V. Belogub*
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia Saint-Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg, 199034, Russia
Sergey N. Britvin
Affiliation:
Saint-Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg, 199034, Russia Nanomaterials Research Center, Kola Science Center of the Russian Academy of Sciences, Fersman Str. 14, 184209 Apatity, Russia;
Vladimir V. Shilovskikh
Affiliation:
Saint-Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg, 199034, Russia
Leonid A. Pautov
Affiliation:
Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky ave. 182, Moscow, 115162, Russia
Vasiliy A. Kotlyarov
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia
Maria G. Krzhizhanovskaya
Affiliation:
Saint-Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg, 199034, Russia
Konstantin A. Novoselov
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia
Elisaveta V. Zaykova
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia
Ivan A. Blinov
Affiliation:
South Urals Federal Research Center of Mineralogy and Geoecology, Urals Branch of Russian Academy of Science, Miass, 456317, Russia
*
Corresponding author: Elena V. Belogub; Email: belogub_e@yahoo.com
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Abstract

Selenolaurite, ideally RuSe2, is a new mineral, the first natural ruthenium selenide. It was discovered in an assemblage with Se-bearing moncheite. Both form xenomorphic inclusions in the crystal aggregates of Os–Ir–Ru minerals found at the Ingul gold placer, Urals, Russia. In addition a mineral with selenolaurite composition was found as a euhedral inclusion within grains of Pt–Fe alloy with isoferroplatinum composition at the Kazan gold placer. These placers are situated in the Chelyabinsk district, South Urals, Russia. The selenolaurite from the Ingul placer forms interstitial grains with maximum size of section of 0.05–0.1 mm. Crystals of the selenolaurite from the Kazan placer reach 20 µm in size. Selenolaurite is grey with metallic lustre and is isotropic. Reflectance values [R (%) for COM approved wavelengths (nm)] are 45.8(470), 44.3(546), 43.8(589) and 43.1(650). The chemical composition of the holotype from the Ingul placer corresponds to the empirical formula (Ru0.99Ir0.05)Σ1.04(Se1.92Te0.03S0.01)Σ1.96. Selenolaurite is the selenium-dominant analogue of laurite, RuS2 with a pyrite-type structure. It is cubic, space group Pa3̅, a = 5.9424(2) Å, V = 209.84 2) Å3, Z = 4 and Dcalc. = 8.415 g·cm–3 (calculated on the basis of empirical formula and unit-cell parameters refined by the Rietveld method). The crystal structure has been refined from the powder data to RB = 0.0067. The strongest lines of the powder X-ray diffraction pattern [d(Å), (I), (hkl)] are: 3.434(41)(111), 2.973(90)(200), 2.6580(100)(210), 2.4264(84)(211) and 1.7913(87)(311). The possible sources of a Ru–Se mineralisation in the South Urals are ophiolitic ultramafic rocks enriched in Ru and depleted with sulfur.

Keywords

selenidesrutheniumminerals of platinum group elementspyrite-like structureplacerSouth Urals

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Type
Article
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Mineralogical Magazine , First View , pp. 1 - 13
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: František Laufek

†

Deceased

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