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Cookeite and diaspore in the Back Creek pyrophyllite deposit near Pambula, New South Wales

Published online by Cambridge University Press:  05 July 2018

F. C. Loughnan  and
K. R. Steggles
F. C. Loughnan
Affiliation:
School of Applied Geology, University of New South Wales, Kensington, N.S.W., Australia
K. R. Steggles
Affiliation:
Australian Industrial Refractories Ltd., Mayfield, N.S.W., Australia
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Summary

The occurrence of cookeite, a di/trioctahedral chlorite of composition (Al3.95Fe0.02Mg0.01Li0.81)(Al0.74Si3.26)O10(OH)8, in the Back Creek pyrophyllite deposit near Pambula is described. The mineral is restricted to a relatively narrow zone near the centre of the deposit and although diaspore is also present in this zone the two have not been found in intimate association, it is concluded that the introduction of lithium has been the principal factor controlling development of the cookeite.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 765 - 772
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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