. Early geophysical papers of the Society of Exploration Geophysicists . 0 300 000 720 640 960 12 00 1320 FEET Fig. 3.—Radon profile across South Liberty salt dome. HEAVY MINERAL SEPARATION About 30 grams of each of these samples were ground to pass a 130-mesh sieve. The heavy minerals were first separated by using bromoform in a separatory funnel. This bromoform had a density, as determined by the pyknometer, of It was found, however, that the heavy mineral fraction obtained by this separation contained quartz and calcite. Consequently, this heavy mineral fraction was again separated, Th
. Early geophysical papers of the Society of Exploration Geophysicists . 0 300 000 720 640 960 12 00 1320 FEET Fig. 3.—Radon profile across South Liberty salt dome. HEAVY MINERAL SEPARATION About 30 grams of each of these samples were ground to pass a 130-mesh sieve. The heavy minerals were first separated by using bromoform in a separatory funnel. This bromoform had a density, as determined by the pyknometer, of It was found, however, that the heavy mineral fraction obtained by this separation contained quartz and calcite. Consequently, this heavy mineral fraction was again separated, Thoulet's solution (density ) being used. This gave a very complete separation and was adopted as standard pro- cedure. 1 E. H. Biichner, Radioakt., Vol. 10 (1913), p. 516. W. Waters, Phil. Mag., Vol. 19 (1910), p. 903. R. H. Strutt, Proc. Roy. Soc, Vol. 84 (1910), p. 377. A. Gockel, Die Radioaktivitat von Boden und Quellen (Braunschweig, 1914). St. Meyer and Schweidler, Radioaktivitat (Leipsic, 1927). 514
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