Rabbitman- Blue Sky is right- it's called flintknapping and there are now tons of sites and lots of videos devoted to it. I started knapping about 20 years ago and got hooked real quick. It takes years to get good at it but
not long to learn to make something that would work so go for it. If you don't have flint, chert, obsidian or any other knppable rock, ebay has a category for flint knapping and you can get rock there for a lot less than in rock shops. Regarding the useability of stone knives, they are excellent if used within their design limits, which is soft tissue only. A properly made obsidian knife will have an edge far sharper than than is possible with steel-
In fact, many hunters prefer a good obsidian knife for skinning game than a modern knife- and I found skinning a deer with an obsidian knife much easier than with steel and resharpening is easier once you get the hang of pressure flaking. But it doesn't hold that awesome edge for long, and if it gets dropped on a hard surface or gets stepped on (obsidian anyway), it breaks.
There is no comparison between steel and stone (except for initial sharpness
if done right)- it's no wonder that stone arrowheads and knives were abandoned by the indians the moment they got supplied with iron and steel.
