Anorthosite
Part of Hall of Planet Earth.
On Tuesday, October 20, the Museum will close at 3 pm, and the Hall of Ocean Life will be closed all day.
Part of Hall of Planet Earth.
This is an anorthosite, composed almost entirely of plagioclase (white). Pyroxene occupies the spaces between the plagioclase crystals. Although several thick layers of anorthosite exist in the Stillwater Complex, these rocks are rare, and how they form is poorly understood.
AMNH collection