Crystal structure of Pb-bearing watanabeite from Pefka, Greece

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F24%3A10136678" target="_blank" >RIV/00023272:_____/24:10136678 - isvavai.cz</a>
Result on the web
<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/crystal-structure-of-pbbearing-watanabeite-from-pefka-greece/18921585318E0FE9322BBA29ED87017B" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/crystal-structure-of-pbbearing-watanabeite-from-pefka-greece/18921585318E0FE9322BBA29ED87017B</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1180/mgm.2024.14" target="_blank" >10.1180/mgm.2024.14</a>

Result language
angličtina
Original language name
Crystal structure of Pb-bearing watanabeite from Pefka, Greece
Original language description
Watanabeite from the Pefka epithermal deposit, northeastern Greece, was examined using single-crystal X-ray diffraction and electron microprobe analysis. Empirical formula of watanabeite is Cu3.93Fe0.10Ag0.01Pb0.23(As1.55Sb0.19)Σ1.74S4.99. This mineral is orthorhombic, space group Amm2, with unit-cell parameters a = 10.9601(5), b = 14.6498(8), c = 10.3001(5) Å, V = 1653.82(14) Å3, Z = 8. The crystal structure was solved and refined to R1 = 0.0471 for 2108 unique reflections with Fo > 4σ(Fo) and 123 refined parameters. The crystal structure of watanabeite can be described as a three-dimensional framework of Cu-centered tetrahedra; cavities of the tetrahedral scaffolding host Cu6S and As2(Pb,Sb,As)2S7 clusters. On the basis of structural data, the formula of watanabeite could be written as [III]Cu3[IV]Cu5As3(Pb,Sb,As)S10 (Z = 4), considering the three independent three-fold Cu sites and the three independent tetrahedrally coordinated Cu sites as aggregated positions. The occurrence of Pb2+ in watanabeite is probably related to the substitution Cu+ + (As,Sb)3+ = 2Me2+, where Me = Pb, Fe, Zn, and formally divalent Cu. The relations with tetrahedrite-group minerals are discussed on the basis of the refined structural model, highlighting possible crystal chemical implications of such relationships.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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