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Crystal structure of austinite, CaZn(AsO4)OH

Published online by Cambridge University Press:  05 July 2018

Lori A. Clark ,
Joseph J. Pluth ,
Ian Steele ,
Joseph V. Smith  and
Stephen R. Sutton
Lori A. Clark
Affiliation:
Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USA
Joseph J. Pluth
Affiliation:
Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
Ian Steele
Affiliation:
Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
Joseph V. Smith
Affiliation:
Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
Stephen R. Sutton
Affiliation:
Department of Geophysical Sciences and Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
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Abstract

Austinite belongs to the adelite mineral group of calcium and lead arsenates, and has the conichalcite/descloizite type of crystal structure. The crystal structure of nearly pure austinite, CaZn(AsO4)OH, was redetermined (R = 0.014) and the absolute configuration identified. The space group P212121 and cell parameters a 7.5092(8), b 9.0438(9), c 5.9343(8) Å match previous data. Zinc octahedra share edges to form chains parallel to c. Arsenic tetrahedra share vertices with the Zn octahedra to generate a compact framework. Calcium square antiprisms share edges to make chains parallel to a that occupy the channels in the zinc-arsenic framework.

Keywords

austinitecrystal structureadelite group
Type
Research Article
Information
Mineralogical Magazine , Volume 61 , Issue 408 , October 1997 , pp. 677 - 683
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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