Abstract
SIR E. RAY LANKESTER (NATURE, June 7, p. 283) attributes the black colour of flint to carbon, but has he considered whether ferrosoferric oxide may be the cause of the colour?
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CAVEN, R. The Origin of Flint . Nature 99, 306 (1917). https://doi.org/10.1038/099306c0
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DOI: https://doi.org/10.1038/099306c0
