Thesaurus / obsidians
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
EXAMPLE SENTENCES FROM THE WEB
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
The cochero, says that the place is known as itzlis—the obsidians, the knives.
In Indian Mexico (1908)Frederick Starr