Shortcut Navigation:
Anorthosite

Anorthosite

Anorthosite

  • Exhibition Text

    • This is an anorthosite, composed almost entirely of plagioclase (white).  Pyroxene occupies the spaces between the plagioclase crystals.  Although several thick layers of anorthosite exist in the Stillwater Complex, these rocks are rare, and how they form is poorly understood.

      AMNH collection

      Show more
  • For Educators

    • Topic: Earth Science

      Subtopic: Earth Structure

      Keywords: Anorthosite, Intrusions (Geology), Plagioclase, Pyroxene, Stillwater County (Mont.)

American Museum of Natural History

Central Park West at 79th Street
New York, NY 10024-5192
Phone: 212-769-5100

Open daily from 10 am - 5:45 pm
except on Thanksgiving and Christmas
Maps and Directions

Enlighten Your Inbox

Stay informed about Museum news and research, events, and more!