17 March 2016
Here are two views of a single anorthosite cobble, collected in the Adirondack Mountains of upstate New York:
Raw, natural surface:
Slabbed and polished surface:
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!