Obsidian main content.


Part of Hall of Planet Earth.

Obsidian AMNH/R.Mickens

Exhibition Text

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

For Educators

Topic: Earth Science

Subtopic: Volcanoes

Keywords: Medicine Lake (Cal.), Rhyolite, Volcanoes, Lava, Volcanism

Audience: General