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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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How to use obsidians in a sentence
Pumice-stone is usually reckoned to be a volcanic product, resulting, probably, from the action of fire upon obsidians.A DICTIONARY OF ARTS, MANUFACTURES AND MINESANDREW URE
Some of the most important varieties of acid lavas are known as trachytes, andesites, rhyolites, and obsidians.THE WONDER BOOK OF VOLCANOES AND EARTHQUAKESEDWIN J. HOUSTON
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