Like other igneous rocks, the glossy glass originates from ... although it can take on hues of green, brown, and other colors due to impurities. Because of the lack of crystals in the overall ...
The Journal of Geology, Vol. 23, No. 8, Supplement: The Later Stages of the Evolution of the Igneous Rocks (Nov. - Dec., 1915), pp. 1-91 (91 pages) ...
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