I don`t know if you would be aware, but didn`t surgeons use or still use, pieces of flint for fine procedures because flint is sharp to the molecular level, not micron as would be steel?
No, I`m not making that up...read it somewhere within the last five years..
heart surgeons IIRC, the edge of an obsidian blade can be exactly one SiO2 molecule thick.....cant sharpen steel that fine.......but it does loose its edge much faster than steel.....
I read something about that, also. IIRC, the material wasn't flint, but some type of volcanic lava that was similiar to glass, or glass- like. The article I read said that small blades of it were used in surgery, such as eye surgery. The downside was that it was extremely fragile.
Again, IIRC, the article said that someone in either VA or W. VA made them
