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The cause of coloration in Derbyshire Blue John banded fluorite and other blue banded fluorites

Published online by Cambridge University Press:  05 July 2018

K. J. D. Mackenzie  and
J. M. Green
K. J. D. Mackenzie
Affiliation:
Dept. of Ceramics with Refractories Technology, University of Sheffield
J. M. Green
Affiliation:
Dept. of Ceramics with Refractories Technology, University of Sheffield
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Summary

The cause of coloration of Blue John fluorite from Castleton, Derbyshire, and blue banded fluorites from Ashover, Derbyshire, and Weardale, Co. Durham, has been investigated by a number of techniques, including mass spectrometry, optical spectroscopy, and paramagnetic resonance measurements on natural and irradiated samples. In all respects Blue John is indistinguishable from the other blue banded fluorites. Although traces of hydrocarbons were found in all the natural fluorites including Blue John, they are shown not to be the cause of the colouration. The optical spectra and bleaching behaviour are consistent with colouration by colloidal calcium rather than F-centres. The causes of colour banding are discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 296 , December 1971 , pp. 459 - 470
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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Footnotes

1

Present address: Chemistry Division, D.S.I.R., Gracefield, Wellington, New Zealand.

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