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Segregation and cation-ordering in sjögrenite and pyroaurite

Published online by Cambridge University Press:  05 July 2018

H. F. W. Taylor
H. F. W. Taylor*
Affiliation:
Department of Chemistry, University of Aberdeen, Old Aberdeen, Scotland
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Summary

A specimen from Långban, Sweden, was found to consist largely of sjögrenite in which segregation and ordering of the metal cations had occurred, yielding an intergrowth of regions of two main types with compositions probably of or near Mg2/3Fe1/3(OH)2(CO3)1/6(H2O)0·4 and Mg12/13Fe1/13(OH)2(CO3)1/26(H2O)0·8. To a smaller extent segregation had proceeded further, giving regions probably approximating to the end-member Mg(OH)2.H2O. It is suggested that the names sjögrenite and pyroaurite be used for the 2H- and 3R- polytypes of this structure irrespective of Mg:Fe ratio, segregation, or cation ordering.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 338 - 342
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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References

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