• 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

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  • For Educators

    • Topic: Earth Science

      Subtopic: Minerals and Resources

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

      Audience: General