Tower I hae been knapping nothing but hard rock lately.  I collected about 1000lbs of Argillite, its like basalt but a little different.  Its metamorphosed or indurated shale.  The Lenape and the Maori used it a lot.  I also have some touh NY rock silicified shale or esopus, some normanskill, a few pieces of Onondaga and I have a lot of local Quartzite.  If you or any one are interested let me know...I also have hornstone, novaculite, Flintridge, obsidian, few pieces coral, coastal plains, a few more I cant remember off hand.
ps u can see what I been doing with some of it on PaleoPlanet...I have the banner pic on oldtool thread...a killer quartzite bifurcate..scroll down and see the Dalton, and argillite Susqhuehanna point..also a banner pic...
Russ