Quote Originally Posted by Hotsauce View Post
The grain size is too large, so it will never take a good edge like a nice carbon steel blade. This is the same reason that HSS blades are sharper than carbide. I used to be a toolmaker, I know cutters.

John C.
Totally agree, taking grain size down to the last molecule is where sharp REALLY happens. Flint knives, spear points & arrow heads are extraordinary.

My cousin was involved in the effort to get flint knapped scalpels AMA approved for non invasive surgeries.

http://www.main.nc.us/sams/obsidian.html

(no, Dorothy is not my cousin)