Home Kenorozhdestvenskayaite-(Fe), Ag6(Ag4Fe2)Sb4S12□: A new tetrahedrite group mineral containing a natural [Ag6]4+ cluster and its relationship to the synthetic ternary phosphide (Ag6M4P12) M6′
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Kenorozhdestvenskayaite-(Fe), Ag6(Ag4Fe2)Sb4S12□: A new tetrahedrite group mineral containing a natural [Ag6]4+ cluster and its relationship to the synthetic ternary phosphide (Ag6M4P12) M6

  • Kai Qu ORCID logo EMAIL logo , Weizhi Sun , Fabrizio Nestola ORCID logo , Xiangping Gu , Zeqiang Yang , Xianzhang Sima , Chao Tang , Guang Fan and Yanjuan Wang ORCID logo EMAIL logo
Published/Copyright: July 9, 2024
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Abstract

[Ag6]4+ clusters are extremely rare in nature (only found in Ag-rich tetrahedrite group minerals). Due to their remarkable structures and some promising applications, a few synthesis phases that contain octahedral [Ag6]4+ clusters have been reported. However, the kinds of natural conditions that promote the formation of subvalent hexasilver clusters in tetrahedrite group minerals are still unclear. Kenorozhdestvenskayaite-(Fe), ideally Ag6(Ag4Fe2)Sb4S12□ is a new tetrahedrite group mineral containing a natural [Ag6]4+ cluster, found in the Yindongpo gold deposit, Weishancheng ore field, Henan Province, China. This new species occurs at the edges of galena crystals as anhedral grains of 2 to 20 μm in size and is associated with pyrargyrite, pyrrhotite, and siderite. Kenorozhdestvenskayaite-(Fe) is black in color with metallic luster. It is brittle with conchoidal fracture and has a calculated density of 5.329 g/cm3. The empirical formula calculated on the basis of cation = 16 apfu is M(2)Ag6M(1)(Ag2.41Cu1.20Fe1.84Zn0.71)Σ6.16X(3)(Sb3.82As0.01)Σ3.83S(1)S11.60S(2)□. It is cubic, with space group I43m, a = 10.7119(6) Å, V = 1229.1(2) Å3, and Z = 2. Since kenorozhdestvenskayaite-(Fe) is a new tetrahedrite group mineral containing a natural [Ag6]4+ cluster, its structure is comparable to the synthetic ternary phosphide (Ag6M4P12) M6 . The presence of the unusual mineral assemblages, i.e., pyrrhotite and pyrargyrite, as well as the other keno-end-member tetrahedrites, indicates a low-fS2 state for the mineralization stage, probably a result of the fluid boiling process in an open system that likely contributed to the formation of S-deficient tetrahedrites.

Acknowledgments and Funding

The helpful comments from Adam Pieczka, Sergey Krivovichev, associate editor Kimberly Tait, and technical editor are greatly appreciated. This study was financially supported by geological exploration project of Henan Geological and Mineral Exploration and Development Bureau (Yudikuang202205), National Natural Science Foundation of China (92062220, 42072054), China Geological Survey Project (DD20190121), and China Scholarship Council (CSC) (202106400047, 202108575009).

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Received: 2023-05-26
Accepted: 2023-09-30
Published Online: 2024-07-09
Published in Print: 2024-07-26

© 2024 by Mineralogical Society of America

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