- a volcanic glass similar in composition to granite, usually dark but transparent in thin pieces, and having a good conchoidal fracture.
Origin of obsidian
Examples from the Web for obsidian
“I think the main reason is the availability of information and community groups that the Internet provides,” said Obsidian.The Next Big Environmental Fight: Tampons?
May 2, 2014
Dragonglass: The name accorded to volcanic glass or obsidian.‘Game of Thrones’ Season 3 for Dummies
March 27, 2013
Agates, cornelians, obsidian, are also among the products of this nature.Mexico
Charles Reginald Enock
“Looks like black glass, sir,” said Ned, kicking a piece of obsidian.Jack at Sea
George Manville Fenn
I was to do the heating of the obsidian and Pitamakan was to do the flaking.With the Indians in the Rockies
James Willard Schultz
Their weapons were slings, spears, and arrows with points made of obsidian or bone.Mexico
But many of them are of obsidian, some of which are beautifully clear.A Journal from Japan
Marie Carmichael Stopes
- a dark volcanic glass formed by very rapid solidification of lavaAlso called: Iceland agate
Word Origin and History for obsidian
"dark, hard volcanic rock," 1650s, from Latin obsidianus, misprint of Obsianus (lapis) "(stone) of Obsius," name of a Roman alleged by Pliny to have found this rock in Ethiopia.
- A shiny, usually black, volcanic glass. Obsidian forms above ground from lava that is similar in composition to the magma from which granite forms underground, but cools so quickly that minerals do not have a chance to form within it.