Ticket reservations are required. Facial coverings are strongly recommended. See Health and Safety.
Part of Hall of Planet Earth.
Obsidian is a volcanic glass, a comparatively rare and crystal-poor form of rhyolite, the most silica-rich lava. It forms when lava is quenches, or rapidly cooled. Obsidian is a major component of Glass Mountain.
Provided by Jeff Dinnel, Tionesta, California