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Brusnitsynite, MnCuPbAsSbS, a first As-dominant member of the lillianite-andorite homologous series from the Vorontsovskoe gold deposit, Northern Urals, Russia

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PII
S2658435225060033-1
DOI
10.7868/S2658435225060033
Publication type
Article
Status
Published
Authors
A.V. Kasatkin
  • Affiliation: Fersman Mineralogical Museum of the Russian Academy of Sciences
J. Plasil
  • Affiliation: Institute of Physics of the CAS, v.v.i.
F.D. Sandalov
  • Affiliation: South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
F. Nestola
  • Affiliation: University of Padova
R. Skoda
  • Affiliation: Masaryk University
V.V. Gurzhiy
  • Affiliation: Institute of Earth Sciences, Saint Petersburg State University
A.A. Agakhanov
  • Affiliation: Fersman Mineralogical Museum of the Russian Academy of Sciences
S.Y. Stepanov
  • Affiliation: South Urals Federal Research Center of Mineralogy and Geoecology of UB RAS
Volume/ Edition
Volume 154 / Issue number 6
Pages
40-58
Abstract
Brusnitsynite, ideally MnCuPbAsSbS is a new sulfosalt from the Vorontsovskoe Au deposit, Sverdlovskaya Oblast, Northern Urals, Russia. It forms rare anhedral grains up to 0.35×0.20 mm which are included in carbonate breccias composed of calcite, dolomite, baryte and quartz, and cemented by pyrite, realgar and stibnite. Other minerals directly associated with brusnitsynite are akhatsite, alabandite, arsenic, arsenopyrite, chabourneite, coloradoite, clerite, dalnegroite, écrinite, getchellite, native gold, luboržákite, routhierite, sphalerite, and wakabayashiite. This new mineral is opaque, it has a black color and metallic luster. It is brittle, with an uneven fracture. Cleavage is not observed. The Vickers hardness (VHN, 50 g load) is 251 kg/mm, corresponding to a Mohs' hardness of ~ 4. The calculated density is 4.545 g/cm. In reflected light, brusnitsynite is light grey and weakly bireflectant. In crossed polars, it is strongly anisotropic, in grey and dark grey tones. No internal reflections are observed. The reflectance values for wavelengths recommended by the Commission on Ore Mineralogy of the IMA are (R/R, %): 29.8/31.0 (470 nm), 29.4/30.4 (546 nm), 28.9/30.1 (589 nm), 28.1/29.2 (650 nm). The chemical composition of brusnitsynite is (electron microprobe, wt.% ): Mn 12.37, Cu 4.57, Ag 0.74, Pb 15.60, As 17.83, Sb 19.48, S 29.62, total 100.21. The empirical formula, based on 22 atoms per formula unit, is MnCuAgPbAsSbS. Brusnitsynite is monoclinic, space group P2/n, with a = 11.597(2), b = 18.905(4), c = 8.732(2) Å, β = 98.47(3)°, V = 1893.4(7) Å and Z = 4. The strongest lines of the powder X-ray diffraction pattern [d, Å (I, %)(hkl)] are: 6.113 (51) (111), 3.264 (52) (151), 3.195 (88) (33-1), 2.864 (61) (11-3), 2.837 (55) (410), 2.831 (100) (161), 2.772 (62) (12-3). The crystal structure of brusnitsynite was refined from the single-crystal X-ray diffraction data to R = 0.0548 for 3890 reflections with I > 3σ(I). The crystal structure contains thin infinite chains of Pb-and Sb-centered polyhedra, extended along [101], as well as slabs extended along [100] of edge-shared Mn polyhedra, octahedrally coordinated by S atoms. Symmetrically equivalent chains and slabs are linked to each other via As and Cu atoms. Brusnitsynite is a new member of the lillianite-andorite homologous series, the first one showing As dominance over Sb and Bi. In addition to lillianite (Bi-dominant) and andorite (Sb-dominant) branches of the series, the third, brusnitsynite (As-dominant) branch is established. The new mineral honors Professor of Saint Petersburg State University Alexei Ilitch Brusnitsyn in recognition of his contribution to the mineralogy of manganese and Mn deposits of Urals.
Keywords
брусницынит новый минерал сульфосоль кристаллическая структура лиллианит-андоритовая гомологическая серия As-доминантная ветвь Воронцовское золоторудное месторождение Северный Урал
Date of publication
16.10.2025
Year of publication
2025
Number of purchasers
0
Views
5

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