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A zincian högbomite and some other högbomites from the Strangways Range, Central Australia

Published online by Cambridge University Press:  05 July 2018

Allan F. Wilson
Allan F. Wilson*
Affiliation:
Department of Geology and Mineralogy, University of Queensland, St. Lucia (Brisbane), Queensland, Australia, 4067
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Summary

Zincian högbomite has formed by hydrous alteration of spinel and biotite in a lens of highly aluminomagnesian sapphirine-bearing granulite-facies rocks. The högbomite forms chestnut-brown {0001} flakes 1 mm across. ε = 1·827, ω = 1·852 (− 0·002). Analysis: BeO 0·10, SiO20·65, Al2O3 59·69, TiO2 5·37, Ga2O3 0·23, Nb2O5 0·01, Fe2O3 5·24, SnO2 0·06, NiO 0·04, ZrO2 0·03, MgO 7•69, Sc2O3 0·01, CoO 0·11, ZnO 3·08, FeO 17·52, In2O3 0·05, MnO 0·12. The pattern of d-spacings is anomalous. Other högbomites from the region have exsolved from cordierite or titaniferous opaque oxides.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 319 , September 1977 , pp. 337 - 344
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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References

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