| Reference Type | Journal (article/letter/editorial) |
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| Title | The cause of coloration in Derbyshire Blue John banded fluorite and other blue banded fluorites |
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| Journal | Mineralogical Magazine |
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| Authors | Mackenzie, K. J. D. | Author |
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| Green, J. M. | Author |
| Year | 1971 (December) | Volume | 38 |
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| Issue | 296 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_38/38-296-459.pdf+ |
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| DOI | doi:10.1180/minmag.1971.038.296.08Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 6504 | Long-form Identifier | mindat:1:5:6504:1 |
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| GUID | 0 |
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| Full Reference | Mackenzie, K. J. D., Green, J. M. (1971) The cause of coloration in Derbyshire Blue John banded fluorite and other blue banded fluorites. Mineralogical Magazine, 38 (296) 459-470 doi:10.1180/minmag.1971.038.296.08 |
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| Plain Text | Mackenzie, K. J. D., Green, J. M. (1971) The cause of coloration in Derbyshire Blue John banded fluorite and other blue banded fluorites. Mineralogical Magazine, 38 (296) 459-470 doi:10.1180/minmag.1971.038.296.08 |
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| In | (1971, December) Mineralogical Magazine Vol. 38 (296) Mineralogical Society |
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| Abstract/Notes | SummaryThe 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. |
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