Here are two views of a single anorthosite cobble, collected in the Adirondack Mountains of upstate New York:
Raw, natural surface:
[gigapan id=”185220″] Link
Slabbed and polished surface:
[gigapan id=”185217″] Link
As you zoom in and explore these GIGAmacro images, see if you can find the delicate little “necklaces” (reaction rims) of garnet wrapping around the few isolated pyroxenes!