Shortcut Navigation:
Gore Mountain Garnet

Gore Mountain garnet

Gore Mountain garnet

  • Exhibition Text

    • This sample of garnet-bearing amphibolite is a spectacular illustration of how metamorphism and deformation can cause a complete change in texture. Originally, the rock was a gabbro consisting of tiny grains of the minerals olivine, pyroxene, and plagioclase. During deformation at high temperature and pressure, water seeped into the rock and reacted with the original minerals to form hornblende (black) and garnet (red). The water allowed the minerals, especially the garnet, to grow to enormous sizes.

      Loaned by Department of Earth and Environmental Sciences, Columbia University, New York, New York

      Show more
  • For Educators

    • Topic: Earth Science

      Subtopic: Minerals and Resources

      Keywords: Garnet, Minerals, Mineralogy, Metamorphism (Geology)

      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!