Abstract
QUARTZ crystals with zonal colour from the Trans-baikal region were found with inclusions of monazite crystals (diameter 0·1–1·0 mm.) around which the quartz was of an intense smoky colour. The coloration, more intense at the centre, shaded off gradually towards the periphery of the halo. Although the boundaries of the halo were not sharp, yet they were sufficiently distinct to enable measurements of the halo to be made (Fig. 1). Haloes of all dimensions from 0·5 mm. to 5–6 mm. diameter can be found in the same quartz specimen.
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LAEMMLEIN, G. Coloured Haloes Surrounding Inclusions of Monazite in Quartz. Nature 155, 724–725 (1945). https://doi.org/10.1038/155724b0
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DOI: https://doi.org/10.1038/155724b0
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