J 2021

Auerbakhite, MnTl2As2S5, a new thallium sulfosalt from the Vorontsovskoe gold deposit, Northern Urals, Russia

KASATKIN, Anatoly V., Jakub PLÁŠIL, Emil MAKOVICKY, Nikita V CHUKANOV, Radek ŠKODA et. al.

Základní údaje

Originální název

Auerbakhite, MnTl2As2S5, a new thallium sulfosalt from the Vorontsovskoe gold deposit, Northern Urals, Russia

Autoři

KASATKIN, Anatoly V. (garant), Jakub PLÁŠIL, Emil MAKOVICKY, Nikita V CHUKANOV, Radek ŠKODA (203 Česká republika, domácí), Atali A. AGAKHANOV, Sergey Y. STEPANOV a Roman S PALAMARCHUK

Vydání

Journal of Geosciences, Czech Geological Survey, 2021, 1802-6222

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

Impakt faktor

Impact factor: 1.778

Kód RIV

RIV/00216224:14310/21:00124456

Organizační jednotka

Přírodovědecká fakulta

DOI

UT WoS

000677614600002

Klíčová slova anglicky

auerbakhite; new sulfosalt; thallium; crystal structure; Vorontsovskoe gold deposit; Northern Urals

Štítky

Příznaky

Mezinárodní význam, Recenzováno
Změněno: 24. 3. 2022 10:15, Mgr. Marie Šípková, DiS.

Anotace

V originále

Auerbakhite (IMA 2020-047), MnTl2As2S5, is a new sulfosalt from the Vorontsovskoe gold deposit, Sverdlovsk Oblast', Northern Urals, Russia. The new mineral occurs in limestone breccias composed of calcite, dolomite, baryte, clinochlore, fluorapatite and quartz, and cemented by major realgar, orpiment and pyrite. Other minerals directly associating with auerbakhite include alabandite, bernardite, christite, cinnabar, coloradoite, dalnegroite, gillulyite, gold, hutchinsonite, imhofite, lorandite, metacinnabar, philrothite, rebulite, routhierite, sphalerite, and vrbaite. Auerbakhite forms rare and very small short-prismatic crystals and irregular grains which do not exceed 15 x 5 mu m. It is transparent, has a bright red color and adamantine luster. Auerbakhite is brittle, with an uneven fracture. Cleavage is not observed. The calculated density is 5.245 g/cm(3). In reflected light, auerbakhite is light gray, weakly bireflectant. In crossed polars, it is distinctly anisotropic, in light gray and brown tones, with abundant bright red internal reflections. The empirical formula of auerbakhite is Mn1.04Tl1.97Pb0.02As1.95S5.02 (based on 10 atoms pfu). Prominent features in the Raman spectrum include bands of Mn-S and As-S stretching vibrations and numerous low-frequency bands related to mixed soft modes involving bending and Tl-S stretching vibrations. Auerbakhite is orthorhombic, space group Cmce, a = 15.3280(15) angstrom, b = 7.662(7)angstrom, c = 16.6330(14)angstrom, V = 1953.40(18)angstrom(3) and Z = 8. The crystal structure of auerbakhite was refined from the single-crystal X-ray diffraction data to R = 0.0723 for 307 observed reflections with I-obs > 3 sigma(I). Auerbakhite is isostructural to the synthetic phase Tl2MnAs2S5. Its crystal structure consists of complex (001) layers based on a set of MnS4 columns parallel to [010] and are composed of edge-sharing slightly irregular MnS6 octahedra. The columns are connected via Tl1 and are framed by paired AsS3 pyramids with lone electron pairs oriented into interlayer space. Highly irregular Tl(2)S-6 coordination polyhedra are situated in interlayers and share ligands with the layers. The new mineral honors Russian mining engineer, manufacturer and mineralogist Alexander Andreevitch Auerbakh whose activities were closely related to Northern Urals.