Part of Hall of Planet Earth.

Close-up of rock specimen labeled as number six.

This harzburgite is one of the lowermost layers of the Stillwater Complex.  It is composed of green olivine and black orthopyroxene (bronzite).  The white mineral is plagioclase (labradorite), which crystallized in the interstices after the olivine and bronzite had accumulated.

AMNH collection