Abstract
Abstract Chondrites have uniform germanium contents: the average of 18 samples is 10.6 ppm. Ge, with the range 9.0–12.4 ppm. The common igneous rocks do not differ greatly in germanium content as shown by the averages: granitic rocks 1.3 ppm., intermediate rocks 1.5 ppm., basalts and diabases 1.3 ppm., gabbros 1.2 ppm., and ultramafic rocks 1.0 ppm. The average for the lithosphere or the crustal rocks may be taken as 1.5±0.5 ppm. Ge. Shales contain 2 ppm. Ge. Oceanic red clay also contains the similar amount. The germanium content of sedimentary materials seems to be somewhat higher than that of igneous rocks because of the possible escape of germanium in hydrothermal and volcanic emanations.
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