The darker colored one just looks like a variety of rhyolite from what I can see in the pic. Could possibly be quartzite, hard to tell without seeing it in person but I'd say rhyolite. The lighter colored one is probably some sort of rhyolitic tuff or breccia-some of those rocks were formed from volcanic ash and stuff. It looks like a pretty good grade of rock, I worked one piece of tuff that I found in the Uwharries that was really good rock.
