Norite main content.


Part of Hall of Planet Earth.


Exhibition Text

This norite is composed of plagioclase (labradorite, white) and orthopyroxene (bronzite, brown).  The norite layer is above the harzburgite because the plagioclase crystallized later than the olivine.

AMNH collection

For Educators

Topic: Earth Science

Subtopic: Minerals and Resources

Keywords: Geology, Stratigraphic, Plagioclase, Stillwater County (Mont.), Minerals, Mineralogy

Audience: General