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Lithiophorite from the Leeht mines, Tomintoul, Banffshire

Published online by Cambridge University Press:  05 July 2018

M. J. Wilson ,
M. L. Berrow  and
W. J. McHardy
M. J. Wilson
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
M. L. Berrow
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
W. J. McHardy
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
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Summary

The constituent manganese minerals of an ore body located at the Lecht mines near Tomintoul include cryptomelane and lithiophorite. The latter, now known to occur extensively in soils, was characterized by X-ray, thermal, and electron microscope techniques. Lithiophorite yields a distinctive differential thermal curve and this was studied in some detail. A platy morphology is revealed under the electron microscope and from selected-area electron diffraction patterns it was concluded that the b parameter of the mineral is 8·73 Å, three times the value determined by Wadsley (1952). As suggested by Wadsley, this could arise from the distribution of lithium ions. Chemical analysis shows that the Lecht lithiophorite is slightly unusual in that it has a high iron and zinc content but is relatively low in cobalt. The associated cryptomelane contains a significant amount of thallium.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 618 - 623
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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