East Pacific Rise pillow basalt main content.

East Pacific Rise pillow basalt

East Pacific Rise Pillow Basalt AMNH/R.Mickens

Exhibition Text

The reddish rind on this pillow is made of palagonite, a clay-rich layer that formed when pillow’s hot exterior reacted with cold seawater.  The black manganese minerals on the surface build up over time, indicating that this pillow is older than others displayed here.

Loaned by the Scripps Institute of Oceanography

For Educators

Topic: Earth Science

Subtopic: Volcanoes

Keywords: Palagonite, Ocean bottom, Volcanoes, Basalt, Magmas, Mid-ocean ridges, Lava, Volcanic eruptions

Audience: General