black granite rock

BLACK GRANITE - geocaching.com- black granite rock ,There are a number of quarries near Mellen that produce a stone locally called "black granite".The rock is more correctly identified as anorthosite and can also be seen in many roadcut exposures in the area, such as this one.Gabbro: Igneous Rock - Pictures, Definition & MoreGabbro is an intrusive igneous rock that is black in color and has a composition similar to basalt.