Journal of science of the Hiroshima University. Ser. C, Geology Volume 2 Issue 1
published_at 1957

A Trial for the Rapid Determination of Volcanic Rocks: The relation of the refractive indices of melted rock-glasses to their chemical compositions

MUKAE Michitoshi
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JSHUCG_2-1_21.pdf
Abstract
It becomes evident that the refractive indices of artificially prepared rock-glasses easily by melting in the flame of oxygen-gas have an intimate relation to their chemical compositions, being clearly shown on certain smooth curves. As to some of the Tertiary calc-alkalic rocks obtained from the San-in district, is their interrelation inspected practically in the present paper. The method hereunder referred to may be utilizable to determine rapidly a large number of volcanic rocks such as tuffs or tuff-breccias.