Abstract
J. C. BRANNER, in studying the “Minerals associated with Diamonds and Carbonados in the State of Bahia, Brazil” (Amer. Journ. Sci., ser. 4, vol. xxxi., 1911, p. 480), comes to the conclusion that the diamonds originated by metamorphic action in the quartzites in which they are occasionally found, together with other minerals characteristic of metamorphic rocks. The description given of these “Lavras quartzites,” which may be of Carboniferous age, and the admitted proximity of gneissic and more highly metamorphosed rocks in the country round them (p. 489), make the reader willing to suspend judgment.
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C., G. Recent Work in Mineralogy and Petrography . Nature 89, 512–513 (1912). https://doi.org/10.1038/089512a0
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DOI: https://doi.org/10.1038/089512a0
