Shortcut Navigation:
Stillwater Gabro_HERO

An exact age for an old rock- Stillwater gabro

An exact age for an old rock

  • Exhibition Text

    • This gabbro formed by crystallization of magma.  In order to date the rock, the three minerals that make it up were separated from one another.  Three vials containing these minerals are shown here.  The white mineral is plagioclase, the green one clinopyroxene, and the black one orthopyroxene.  The fourth vial contains the crushed whole rock.

      AMNH collection

      Show more
  • For Educators

    • Topic: Earth Science

      Subtopic: Geologic Time

      Keywords: Gabbro, Geochemistry, Plagioclase, Pyroxene, Radioactive dating

      Audience: General

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!