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The crystal structure of julgoldite

Published online by Cambridge University Press:  05 July 2018

Rudolf Allmann  and
Gabrielle Donnay
Rudolf Allmann
Affiliation:
Fachbereich Geowissenschaften, Philipps-Universität, 355 Marburg, Germany
Gabrielle Donnay
Affiliation:
Department of Geological Sciences, McGill University, Montreal 101 Quebec, Canada
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Summary

The structure of julgoldite, , has been determined and refined to an R value of 4·6 % based on 2417 symmetry-independent reflections, of which 765 are unobserved (weighted R = 4·3 %). The cell dimensions are a 8·922(4), b 6·081(3), c 19·432(9) Å, β 97·60(6)°, the space group is A2/m with Z = 4 and Dcalc 3·56 g cm-3. Julgoldite is isostructural with pumpellyite; the Si-O and Ca-O distances of julgoldite are identical, within experimental accuracy, with corresponding distances in pumpellyite; the Fe-O distances of julgoldite are about 0·09 Å longer than the corresponding (Al, Mg)-O distances in pumpellyite. The four hydroxyl groups and the extent of O-for-OH substitution are identified by valence-sum calculations.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 303 , September 1973 , pp. 271 - 281
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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References

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