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

Oxana V. Karimova, Andrey A. Zolotarev, Bo S. Johanson, Tatiyana L. Evstigneeva

Research output


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.

Original languageEnglish
Pages (from-to)746-752
Number of pages7
JournalMineralogical Magazine
Issue number5
Publication statusPublished - 1 Oct 2020

Scopus subject areas

  • Geochemistry and Petrology

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