Crystal structure and XANES investigation of petzite, Ag 3 AuTe 2

Abstract : Petzite, Ag 3 AuTe 2 , crystallizes in the space group I4 1 32, which is a Sohncke type of space group where chiral crystal structures can occur. The structure refinement of petzite reported long ago [Frueh (1959). Am. Mineral. 44, 693-701] did not provide any information about the absolute structure. A new single-crystal X-ray diffraction refinement has now been performed on a sample from Lake View Mine, Golden Mile, Kalgoorlie, Australia, which has resulted in a reliable absolute structure [a Flack parameter of 0.05 (3)], although this corresponds to the opposite enantiomorph reported previously. The minimum Te-Te distance is 3.767 (3) A ˚ , slightly shorter than the van der Waals bonding distance, which suggests a weak interaction between the two chalcogens. XANES spectra near the Au and Te L III edges suggest that the chemical-bonding character of Au in petzite is more metallic than in other gold minerals.
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Hidetomo Hongu, Akira Yoshiasa, Massimo Nespolo, Tsubasa Tobase, Makoto Tokuda, et al.. Crystal structure and XANES investigation of petzite, Ag 3 AuTe 2. Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials, International Union of Crystallography, 2019, 75 (2), pp.273-278. ⟨10.1107/S2052520619002166⟩. ⟨hal-02090557⟩

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