Abstract
WHETHER a vitreous or otherwise ‘disturbed’ layer forms on particles of quartz produced by size reduction processes has been the subject of a controversy for some time. In an earlier communication1 we reported evidence for the absence of a vitreous or mosaic sub-surface layer. A recent paper by Sakabe et al.2 leaves little doubt that, in their experiments, a thick vitreous layer was formed by the grinding procedure used. Samples were ground in a, mechanical agate mortar for varying times up to 300 h and fractions of mean particle size of approximately 0.5µ were prepared by centrifuging. Some of their observations are summarized here.
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Talbot, J. H., and Kempis, E. B., Nature, 188, 927 (1960).
Sakabe et al., Bull. Nat. Inst. Indust. Health, 4, 1 (1960).
King, E. J., and Nagelschmidt, G., Proc. Pneumoconiosis Conf., Johannesburg, 1959, 78 (J. and A. Churchill, Ltd., London, 1960).
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TALBOT, J., KEMPIS, E. Effect of Grinding on Quartz Particles. Nature 197, 66 (1963). https://doi.org/10.1038/197066a0
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DOI: https://doi.org/10.1038/197066a0
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