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The crystal chemistry of the amphiboles. I: Refinement of the Crystal structure of ferrotschermakite

Published online by Cambridge University Press:  05 July 2018

F. C. Hawthorne  and
H. D. Grundy
F. C. Hawthorne
Affiliation:
Dept. of Geology, McMaster University, Hamilton, Ontario, Canada
H. D. Grundy
Affiliation:
Dept. of Geology, McMaster University, Hamilton, Ontario, Canada
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Summary

Three-dimensional counter-diffractometer data and a full-matrix least-squares method have been used to refine the crystal structure of a ferrotschermakite in the space group C2/m. The chemical composition of the amphibole is with cell parameters a 9·8179(7), b 18·1060(14), c 5·3314(5) Å, and β 105·00(I). Cation site-occupancies were initially assigned by ionic-radius criteria and refined with the constraint that the sum total of the site-occupancies be equal to the chemical analysis.

The A-site shows positional and substitutional disorder and can be better represented by two sites, one on the mirror plane and the other on the 2-fold axis.

Unit weights were used throughout the refinement and the final R-factor for 1207 observed nonequivalent reflections was 4·5 %.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 301 , March 1973 , pp. 36 - 48
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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