Has anyone tried this.... There is alot of petrified wood around the area I live in Colorado. I have a tendency to pick up pieces that I like looking at when I am "hiking" Few pieces end up on the windowsill so I can look at them awhile. One shard was there for a couple of days before I realized it had the basic shape of a rifle/musket flint. This pertified wood is hard and I was wondering if it would work on my smoothie. Has anyone tried this, just picking up a "rock" and clamping it in. Lots of what I read has said the the mountain men preferred flinters because with percussions they could run out of or lose percussion caps.