Abstract
IT has been shown in previous publications1 that at least some of the maxima in the absorption spectra of natural coloured fluorites coincide with those obtained by artificial irradiation, thus completing the proof that the natural colour is due chiefly to radioactivity. Different fluorites show, however, very different colours and absorption spectra. This might be due in part to the fact that the conditions of formation of these minerals may vary greatly. It seemed, therefore, to be of interest to study the bands of different colour which are frequently seen in the same sample of fluorite, in which case the conditions of formation cannot have varied so much.
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References
“Verfärbung und Lumineszenz, Beiträge zur Mineralphysik”, 166 (Springer-Verlag, Wien, 1953). An interpretation, differing from mine, of the absorption spectra of fluorite has been given by Lüty, F. (Z. Phys., 134, 596; 1953), of Göttingen.
Smakula, A., Phys. Rev., 77, 408 (1950); “Verfärbung und Lumineszenz”, 168. It can be pointed out here that these artificial crystals still contain appreciable traces of rare earths, as follows from the coincidence of the maxima in the thermoluminescence spectra observed by Hill, J. J., and Aron, J. (J. Chem. Phys., 21, 223; 1953), with the well-known rare earth emission lines.
“Verfärbung und Lumineszenz”, 173.
“Verfärbung und Lumineszenz”, 188.
“Verfärbung und Lumineszenz”, 196.
Allen, R. D., Amer. Mineral., 37, 910 (1952).
“Verfärbung und Lumineszenz, 115.
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PRZIBRAM, K. Colour Bands in Fluorspar. Nature 172, 860–861 (1953). https://doi.org/10.1038/172860b0
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DOI: https://doi.org/10.1038/172860b0
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