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Tarutinoite, Ag3Pb7Bi7S19, a new member of the lillianite homologous series from the Tarutinskoe copper-skarn deposit, Southern Urals, Russia

Published online by Cambridge University Press:  20 January 2025

Anatoly V. Kasatkin Open the ORCID record for Anatoly V. Kasatkin [Opens in a new window] ,
Cristian Biagioni ,
Fabrizio Nestola Open the ORCID record for Fabrizio Nestola [Opens in a new window] ,
Radek Škoda Open the ORCID record for Radek Škoda [Opens in a new window] ,
Vladislav V. Gurzhiy Open the ORCID record for Vladislav V. Gurzhiy [Opens in a new window] ,
Atali A. Agakhanov  and
Aleksey M. Kuznetsov
Anatoly V. Kasatkin*
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia
Cristian Biagioni
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy
Fabrizio Nestola
Affiliation:
Dipartimento di Geoscienze, Università di Padova, Padova, Italy
Radek Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Brno, Czech Republic
Vladislav V. Gurzhiy
Affiliation:
Institute of Earth Sciences, St. Petersburg State University, Saint-Petersburg, Russia;
Atali A. Agakhanov
Affiliation:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia
Aleksey M. Kuznetsov
Affiliation:
Independent Researcher, Chelyabinsk, Russia
*
Corresponding author: Anatoly V. Kasatkin; Email: anatoly.kasatkin@gmail.com
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Abstract

The new mineral tarutinoite, ideally Ag3Pb7Bi7S19, was found in a fragment of a drill core extracted at the 178.5 m level of borehole #4604 at the Tarutinskoe (Tarutino) copper-skarn deposit, Chelyabinsk Oblast, Southern Urals, Russia. It occurs as anhedral grains up to 0.10 × 0.05 mm intergrown with hessite and galena in magnetite and calcite. Tarutinoite is grey, opaque with metallic lustre, brittle tenacity and uneven fracture. No cleavage and parting are observed. The Vickers’ micro-indentation hardness (VHN, 25 g load) is 178 kg/mm2 (range 165–194, n = 4), corresponding to a Mohs’ hardness of 3.5–4, and calculated density is 7.180 g/cm3. In reflected light, tarutinoite is greyish-white, very weakly bireflectant and non-pleochroic. Under crossed polarisers the new mineral exhibits moderate anisotropy, in grey and dark grey tones with bluish tints. The reflectance values for wavelengths recommended by the Commission on Ore Mineralogy of the International Mineralogical Association are (Rmin/Rmax, %): 45.5/47.9 (470 nm), 43.5/45.0 (546 nm), 43.3/44.1 (589 nm) and 41.8/42.5 (650 nm). The chemical composition (wt.%, electron microprobe data, mean of 7 spot analyses) is Cu 0.30, Ag 8.33, Cd 0.04, Pb 37.12, Bi 37.52, S 15.15, Se 0.40, Te 0.66, total 99.52. The empirical formula calculated on the basis of 36 atoms per formula unit is (Ag3.01Cu0.18)Σ3.19(Pb6.98Cd0.01)Σ6.99Bi7.00(S18.42Se0.20Te0.20)Σ18.82. Tarutinoite is monoclinic, space group C2/m, with a = 13.5447(12), b = 4.1027(3), c = 32.481(4) Å, β = 96.433(9)°, V = 1793.6(3) Å3 and Z = 2. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %) (hkl)] are: 16.15 (48) (0 0 2), 3.407 (69) (1 1 –5), 3.328 (95) (2 0 –9), 3.042 (65) (2 0 –10), 2.941 (100) (3 1 2), 2.910 (55) (3 1 –4), 2.053 (44) (0 2 0). The crystal structure of tarutinoite was refined to R1 = 0.1349 for 2024 reflections with Fo > 4σ(Fo) and 84 refined parameters. The new mineral is the first 7,8L member of the lillianite homologous series. It is named after its type locality.

Keywords

tarutinoitenew mineralchemical compositioncrystal structurelillianite homologous seriesTarutinskoe depositSouthern UralsRussia

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Article
Information
Mineralogical Magazine , Volume 89 , Issue 4 , August 2025 , pp. 483 - 491
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: Owen Missen

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