It looks like most of it is quartzite and the black one may be low grade normanskill. The quartzite looks like it might be pretty good quality. I will not mince words here,Quartzite is tough material and most will not even touch it. There are a few of us here that do and if you aren't afraid to travel I can hook you up with some guys who will teach you to knap it. Actually there are some in Upper New York, one of them even frequents here. there is a gathering in July that gather just for this stuff in Virginia.