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The rock is named for Mt. Tonale, in the Italian Tirol, where it is streaky and
inhomogeneous, with clots and patches of intergrown green hornblende and
brown biotite. The plagioclase feldspar crystals are conspicuously zoned, and
their cores ...
vitreous enamelling: see porcelain enamelling. vitreous texture, descriptive term
for extrusive rocks all or part of which consist of a vitreous, or glassy, substance;
the prefix hyalo- is often used before other terms to indicate the same ...
2 and the Greek Academy 1: 1162g ntinae, subfamily of snakes of the olubridae,
order Squamata. :ristics and classification 16:566g 1, rock fragment within an
intrusive body that is unrelated to the igneous alf. Xenoliths, which represent
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review