Deep-ocean pillow basalt

  • Exhibition Text

    • This sample was dredged from a seafloor spreading center near Japan. The shiny black surface is glass, a product of rapid cooling of lava underwater. The white crystals in the glassy crust are plagioclase, a common mineral in most rocks.

      Loaned by the Geological Survey of Japan

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  • For Educators

    • Topic: Earth Science

      Subtopic: Volcanoes

      Keywords: Plagioclase, Ocean bottom, Volcanoes, Basalt, Mid-ocean ridges, Japan

      Audience: General