obsidian  search
BTigneous rocks
 .volcanic rocks
 ..glasses
 ...obsidian
RTvolcanic glass
Obsidian Dome  search
BTUnited States
 .California
 ..Mono County California
 ...Obsidian Dome
RTLong Valley Caldera
 Inyo Domes
SNOne of the Inyo Domes in Owens Valley, Long Valley, E California. Added to Thesaurus in 1989.
obsidian hydration  search
USEhydration of glass