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Letter |
1 Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0767, U.S.A.
2 Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A.
3 Center for Advanced Radiation Sources (CARS), University of Chicago, Chicago, Illinois 60637, U.S.A.
4 Materials Research Science and Engineering Center, University of Chicago, Chicago, Illinois 60637, U.S.A.
5 Condenced Matter Physics, California Institute of Technology, Pasadena, California 91125, U.S.A.
Correspondence: * E-mail: pburns{at}nd.edu
The structure of quetzalcoatlite, Zn6Cu3(TeO3)2O6(OH)6(AgxPby)Clx+2y, x + y 
2, Z = 1, was solved and refined using data collected at the Advanced Photon Source-GSE-CARS facility, using a 2 x 2 x40 µm3 single crystal. The structure is trigonal, space group P
1m, a = 10.145(1), c = 4.9925(9) Å, V = 445.0(1) Å3, and was refined to R = 5.1 for 395 unique observed reflections. Te6+O6 octahedra and Jahn-Teller distorted Cu2+O4(OH)2 octahedra share edges to form layers parallel to (001), and ZnO2(OH)2 tetrahedra share vertices to form six-member rings parallel to (001). Layers of octahedra and tetrahedra alternate along c, and form a new framework structure by vertex sharing. Channels through the framework parallel to c are occupied by Ag, Pb, and Cl ions. Electron microprobe analysis revealed Ag and Cl overlooked in the original microchemical analysis. Up to one-third of the Ag was substituted by Pb, and a Pb-rich analog may exist.
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