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Hodgesmithite, (Cu,Zn)6Zn(SO4)2(OH)10·3H2O, a new copper zinc sulfate mineral with a unique, decorated, interrupted-sheet structure

Authors :
Peter Elliott
Source :
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 75:1069-1075
Publication Year :
2019
Publisher :
International Union of Crystallography (IUCr), 2019.

Abstract

Hodgesmithite, ideally (Cu,Zn)6Zn(SO4)2(OH)10·3H2O, is a new copper zinc sulfate mineral from the Block 14 Opencut, Broken Hill, New South Wales, Australia. Electron microprobe analysis provided the empirical formula Cu4.84,Zn2.16,Cd0.04[(SO4)1.89,(SiO4)0.12]2.01(OH)9.82·3.15H2O based on 21 oxygen atoms per formula unit. Hodgesmithite is trigonal, space groupP3, witha= 8.1905 (12),c= 7.0990 (14) Å,V= 412.43 (12) Å3andZ= 1. The crystal structure of hodgesmithite,R1= 0.0272 for 5145 reflections withFo> 4σ(Fo) measured with synchrotron X-ray radiation (λ = 0.71080 Å), contains interrupted sheets of edge-sharing Cu(O,OH)6octahedra in the (001) plane. Every seventh octahedral site is vacant and capped by a ZnO4tetrahedron and an SO4tetrahedron which are attached to the sheet above and below this position. The sheets are additionally decorated on one side by SO4tetrahedra that share a vertex incident to three Cu—O(apical) bonds. Interstitial H2O groups lie between the sheets. ZnO4tetrahedra share vertices with SO4tetrahedra from the adjacent sheet to provide linkage between the sheets in thecdirection.

Details

ISSN :
20525206
Volume :
75
Database :
OpenAIRE
Journal :
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials
Accession number :
edsair.doi...........70b99ebda23c502ad65432753016ebe8
Full Text :
https://doi.org/10.1107/s205252061901343x