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Structure and twinning in spencerite

Published online by Cambridge University Press:  05 July 2018

L. Fanfani ,
A. Nunzi  and
P. F. Zanazzi
L. Fanfani
Affiliation:
Istituto di Mineralogia, Università di Perugia, Italy
A. Nunzi
Affiliation:
Istituto di Mineralogia, Università di Perugia, Italy
P. F. Zanazzi
Affiliation:
Istituto di Mineralogia, Università di Perugia, Italy
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Summary

A refinement of the crystal structure of spencerite, Zn4(PO4)2(OH)2·3H2O, was performed on a twin crystal from Salmo, British Columbia. Three-dimensional intensity data were collected by a Weissenberg apparatus. The R index was 0·098 for 335 independent observed reflections. The crystal structure previously determined is essentially confirmed. Co-ordination around Zn is both octahedral and tetrahedral. The atomic arrangement consists of complex sheets of co-ordination octahedra and tetrahedra around Zn and P atoms connected by layers of water molecules. The frequent occurrence of twinning in spencerite is explained from structural considerations.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 298 , June 1972 , pp. 687 - 692
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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