Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.
EXAMPLES FROM THE WEB FOR OBSIDIANS
The cochero, says that the place is known as itzlis—the obsidians, the knives.
Some of the most important varieties of acid lavas are known as trachytes, andesites, rhyolites, and obsidians.