TY - JOUR

T1 - The crystal structure of arsenopalladinite, Pd8As2.5Sb0.5, and its relation to mertieite-II, Pd8Sb2.5As0.5

AU - Karimova, Oxana V.

AU - Zolotarev, Andrey A.

AU - Johanson, Bo S.

AU - Evstigneeva, Tatiyana L.

N1 - Funding Information: The authors are grateful to Luca Bindi, an anonymous reviewer, Structural Editor Daniel Atencio and Associate Editor František Laufek for useful comments and editing the manuscript. We thank Kari Kojonen for providing samples. We acknowledge the Resource Centre of X-ray diffraction studies of St. Petersburg State University for collection of the experimental data. This study was supported by the Russian Academy of Sciences, Program of Fundamental Research. Publisher Copyright: Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - The crystal structure of arsenopalladinite, Pd8As2.5Sb0.5, from the Kaarreoja River, Inari commune, Finnish Lapland, Finland, was solved to R1 = 0.0451 on the basis of single-crystal X-ray diffraction data. The mineral is triclinic, space group P. The unit-cell parameters are: a = 7.3344(7), b = 7.3870(8), c = 7.5255(7) Å, α = 98.869(8), β = 102.566(8), γ = 119.096(11)°, V = 331.19(7) Å3 and Z = 2. The crystal structure of arsenopalladinite consists of an alternation of layers made by pnictogen (As, Sb) and layers made by palladium atoms stacked along the c axis. Arsenic and (As, Sb) nets exhibit a triangular topology (A and D nets), whereas palladium layers show triangular or pentagon-triangular nets (B and C nets). The unit-cell contains 6 layers, with the ABCDCBA stacking sequence. Although arsenopalladinite shows characteristics very similar (nets of the same topology) to the closely-related mineral mertieite-II, Pd8Sb2.5As0.5, it has a different stacking sequence.

AB - The crystal structure of arsenopalladinite, Pd8As2.5Sb0.5, from the Kaarreoja River, Inari commune, Finnish Lapland, Finland, was solved to R1 = 0.0451 on the basis of single-crystal X-ray diffraction data. The mineral is triclinic, space group P. The unit-cell parameters are: a = 7.3344(7), b = 7.3870(8), c = 7.5255(7) Å, α = 98.869(8), β = 102.566(8), γ = 119.096(11)°, V = 331.19(7) Å3 and Z = 2. The crystal structure of arsenopalladinite consists of an alternation of layers made by pnictogen (As, Sb) and layers made by palladium atoms stacked along the c axis. Arsenic and (As, Sb) nets exhibit a triangular topology (A and D nets), whereas palladium layers show triangular or pentagon-triangular nets (B and C nets). The unit-cell contains 6 layers, with the ABCDCBA stacking sequence. Although arsenopalladinite shows characteristics very similar (nets of the same topology) to the closely-related mineral mertieite-II, Pd8Sb2.5As0.5, it has a different stacking sequence.

KW - arsenopalladinite

KW - crystal structure

KW - palladium nets

KW - pnictogen nets

UR - http://www.scopus.com/inward/record.url?scp=85096032650&partnerID=8YFLogxK

U2 - 10.1180/mgm.2020.65

DO - 10.1180/mgm.2020.65

M3 - Article

AN - SCOPUS:85096032650

VL - 84

SP - 746

EP - 752

JO - Mineralogical Magazine

JF - Mineralogical Magazine

SN - 0026-461X

IS - 5

ER -