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An intergrowth of calcic labradorite in a plagioclase-quartz-biotite gneiss from Broken Hill, New South Wales

Published online by Cambridge University Press:  05 July 2018

Evan R. Phillips ,
Bryan E. Chenhall ,
Ian J. Stone  and
J. W. Pemberton
Evan R. Phillips
Affiliation:
Department of Geology, University of Wollongong, Wollongong, N.S.W. 2500, Australia
Bryan E. Chenhall
Affiliation:
Department of Geology, University of Wollongong, Wollongong, N.S.W. 2500, Australia
Ian J. Stone
Affiliation:
Department of Geology, University of Wollongong, Wollongong, N.S.W. 2500, Australia
J. W. Pemberton
Affiliation:
Department of Geology, University of Wollongong, Wollongong, N.S.W. 2500, Australia
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Summary

Compositions of An61 and An69·5 have been determined for two domains in plagioclase from a gneiss. Optical properties indicate that the same compositions apply respectively for an intergrowth of ‘matrix’ and lamellae found in zones between the domains. The intergrowth appears to span the composition range between the Bøggild and Huttenlocher intergrowths.

Type
Research Article
Information
Mineralogical Magazine , Volume 41 , Issue 320 , December 1977 , pp. 469 - 471
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1977

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References

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