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The Lewisian pegmatites of South Harris, Outer Hebrides

Published online by Cambridge University Press:  14 March 2018

O. von Knorring  and
R. Dearnley
O. von Knorring
Affiliation:
Dept. of Geology, University of Leeds.
R. Dearnley
Affiliation:
Dept. of Geology, University of Leeds.
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Summary

A number of representative examples of the Lewisian acid pegmatites of South Harris are described, and the presence of the following minerals has been established: quartz, albite, microcline, biotite, muscovite, magnetite, beryl, spessartine, gahnite, eolumbite, monazite, zircon, pyrite, epidote, tourmaline, apatite, thorite, uraninite, thorogummite, uranophane, kasolite, betafite (?), and allanite. Spectrographic, optical, and X-ray powder data are given for some of these minerals, together with chemical analyses of magnetite, biotite, columbite, gahnite, and spessartine. It is believed that gahnite, nranophane, and the pyrochlore mineral (probably betafite) are recorded for the first time from Britain.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 248 , March 1960 , pp. 366 - 378
Copyright
Copyright © 1960, The Mineralogical Society

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